Removed using namespace std; from GenPath

The issue:
- rpcndr.h defines `byte` as `typedef unsigned char byte`
- stddef header also defines `std::byte` as `enum class byte : unsigned char {}`
- with `using namespace std`, `byte` can be either `byte` or `std::byte` leading to "error: reference to 'byte' is ambiguous"
- the disambiguation was initially fixed by adding `-std=c++11` as additional C/C++ build parameter
- ...but, GenPath is a mixed C and C++ project so `-std=c++11` got passed as argument to both `gcc` and `g++` leading to "error: invalid argument '-std=c++11' not allowed with 'C'"
Removing `using namespace std;` is the correct way to fix it

Contrib/VPatch/Source/GenPat/ChunkedFile.cpp

@@ -29,8 +29,6 @@
 #include "ChunkedFile.h"
 #include "tchar.h"
 
-using namespace std;
-
       ChunkedFile::ChunkedFile(bistream& f, TFileOffset fSize, TFileOffset chunkSize) :
         chunks(NULL) {
 

Contrib/VPatch/Source/GenPat/FileFormat1.cpp

@@ -148,7 +148,7 @@ namespace FileFormat1 {
     return fileCount;
   }
 
-  void writePatch(bostream& patch, bistream& target, vector<SameBlock*>& sameBlocks, TChecksum* sourceCRC, TChecksum* targetCRC, TFileOffset currentFileCount, POSIX::ALT_FILETIME targetTime) {
+  void writePatch(bostream& patch, bistream& target, std::vector<SameBlock*>& sameBlocks, TChecksum* sourceCRC, TChecksum* targetCRC, TFileOffset currentFileCount, POSIX::ALT_FILETIME targetTime) {
     TFileOffset bodySize = 0;
     TFileOffset noBlocks = 0;
     TFileOffset noBlocksOffset = patch.tellp();
@@ -163,7 +163,7 @@ namespace FileFormat1 {
     TFileOffset bodySizeOffset = patch.tellp();
     writeDword(patch,bodySize);
 
-    for(vector<SameBlock*>::iterator iter = sameBlocks.begin(); iter != sameBlocks.end(); iter++) {
+    for(auto iter = sameBlocks.begin(); iter != sameBlocks.end(); iter++) {
       SameBlock* current = *iter;
 
       // store current block

Contrib/VPatch/Source/GenPat/FileFormat1.h

@@ -33,11 +33,9 @@
   #include "PatchGenerator.h"
   #include "POSIXUtil.h"
 
-  using namespace std;
-
   namespace FileFormat1 {
     TFileOffset removeExistingPatch(bistream& in, TFileOffset inSize, bostream& out, TChecksum* removeCRC, bool existenceIsError);
-    void writePatch(bostream& patch, bistream& target, vector<SameBlock*>& sameBlocks, TChecksum* sourceCRC, TChecksum* targetCRC, TFileOffset currentFileCount, POSIX::ALT_FILETIME targetTime);
+    void writePatch(bostream& patch, bistream& target, std::vector<SameBlock*>& sameBlocks, TChecksum* sourceCRC, TChecksum* targetCRC, TFileOffset currentFileCount, POSIX::ALT_FILETIME targetTime);
   }
 
 #endif // FileFormat1_H

Contrib/VPatch/Source/GenPat/GlobalTypes.h

@@ -36,7 +36,10 @@
   #include <ios>
   #include <string>
 
-  using namespace std;
+  using ios = std::ios;
+  using ios_base = std::ios_base;
+  using streamsize = std::streamsize;
+  using streamoff = std::streamoff;
 
   #ifdef _MSC_VER
     typedef unsigned char uint8_t;

Contrib/VPatch/Source/GenPat/POSIXUtil.cpp

@@ -44,8 +44,6 @@
   #include <windows.h>
 #endif
 
-using namespace std;
-
 namespace POSIX {
 
   void TimeT_To_FILETIME(time_t t, ALT_FILETIME *pft ) {

Contrib/VPatch/Source/GenPat/POSIXUtil.h

@@ -31,8 +31,6 @@
   #include <string>
   #include "tchar.h"
 
-  using namespace std;
-
   namespace POSIX {
     typedef struct ALT_FILETIME {
       uint32_t dwLowDateTime;

Contrib/VPatch/Source/GenPat/PatchGenerator.cpp

@@ -44,7 +44,7 @@ PatchGenerator::~PatchGenerator() {
   if(targetCData != NULL) delete[] targetCData;
 }
 
-void PatchGenerator::execute(vector<SameBlock*>& sameBlocks) {
+void PatchGenerator::execute(std::vector<SameBlock*>& sameBlocks) {
   ChunkedFile* sourceTree = new ChunkedFile(source,sourceSize,blockSize);
 
   // sameBlocks: this vector will store blocks that have been found to be the same

Contrib/VPatch/Source/GenPat/PatchGenerator.h

@@ -33,8 +33,6 @@
   #include "GlobalTypes.h"
   #include "ChunkedFile.h"
 
-  using namespace std;
-
   typedef struct SameBlock {
     TFileOffset sourceOffset;
     TFileOffset targetOffset;
@@ -68,7 +66,7 @@
     ~PatchGenerator();
 
     // construct the actual patch
-    void execute(vector<SameBlock*>& sameBlocks);
+    void execute(std::vector<SameBlock*>& sameBlocks);
   };
 
 #endif // PatchGenerator_H

Contrib/VPatch/Source/GenPat/main.cpp

@@ -264,13 +264,13 @@ int _tmain( int argc, TCHAR * argv[] ) {
       }
 
       // create sameBlock storage
-      vector<SameBlock*> sameBlocks;
+      std::vector<SameBlock*> sameBlocks;
       // run the patch generator to find similar blocks
       gen->execute(sameBlocks);
       // construct the actual patch in FileFormat1
       FileFormat1::writePatch(patch,target,sameBlocks,sourceCRC,targetCRC,fileCount,POSIX::getFileTime(targetFileName.c_str()));
       // cleanup sameblocks
-      for(vector<SameBlock*>::iterator iter = sameBlocks.begin(); iter != sameBlocks.end(); iter++) {
+      for(auto iter = sameBlocks.begin(); iter != sameBlocks.end(); iter++) {
         delete *iter;
         *iter = NULL;
       }

Contrib/VPatch/Source/GenPat/tchar.h

@@ -4,8 +4,8 @@
 #include <sstream>
 
 #ifdef _UNICODE
-#  define tout        wcout
-#  define terr        wcerr
+#  define tout        std::wcout
+#  define terr        std::wcerr
 #  define __T(x)      L ## x
 #  define _T(x)       __T(x)
 #  define _tmain      wmain
@@ -17,8 +17,8 @@
 
    typedef wchar_t      TCHAR;
 #else
-#  define tout        cout
-#  define terr        cerr
+#  define tout        std::cout
+#  define terr        std::cerr
 #  define _T(x)       x
 #  define _tmain      main
 #  ifdef _WIN32