Remove redundant (and conflicting) function declarations

The function fchtak() is implemented earlier in the same file. There
is therefore no need to declare the function later in the same file.
The later declarations redefines the function with an empty parameter
list, which conflicts with the original definition.

The function stat() is defined by including <sys/stat.h>. The
following daclaration redefines the function with an empty parameter
list, which conflicts with the original definition.

(cherry picked from commit d28f5ac)

misc/minicern/src/cernlib.c

@@ -172,8 +172,8 @@ int cfstati_(char *fname, int *info, int *lgname)
 #endif
 {
    struct stat buf;
-   char *ptname, *fchtak();
-   int istat=-1, stat();
+   char *ptname;
+   int istat = -1;
    ptname = fchtak(fname,*lgname);
    if (ptname == ((void *)0)) return -1;
    istat = stat(ptname, &buf);
@@ -226,7 +226,7 @@ void cfopei_(int *lundes, int *medium, int *nwrec, int *mode, int *nbuf,
              char *ftext, int *astat, int *lgtx)
 #endif
 {
-   char *pttext, *fchtak();
+   char *pttext;
    int flags = 0;
    int fildes;
    int perm;