Higher zip compression, disable default advzip

As of GDB 13.1, gdb.exe contains data triggering a bug in x64 Explorer
zip integration at last as far back as Windows 7. After recompressing
with advzip, gdb.exe extraction fails with 0x80004005 "Unspecified
error". This happens with both 32-bit and 64-bit gdb.exe regardless of
compiler flags. No other zip program has trouble with this file.

Until this is resolved, give up on advzip and tell zip to use -9. Also
renamed the build script option from -q (quick) to -O (optimize) and
disable its use by default.

Dockerfile

@@ -496,4 +496,4 @@ RUN printf "id ICON \"$PREFIX/src/w64devkit.ico\"" >w64devkit.rc \
         >>$PREFIX/COPYING.MinGW-w64-runtime.txt \
  && echo $VERSION >$PREFIX/VERSION.txt
 ENV PREFIX=${PREFIX}
-CMD zip -qXr - $PREFIX
+CMD zip -q9Xr - $PREFIX

multibuild.sh

@@ -9,7 +9,7 @@
 
 set -e
 arch=""
-compact=auto
+compact=no
 dryrun=
 flavors=""
 suffix="$(git describe --exact-match 2>/dev/null | tr v - || true)"
@@ -25,8 +25,8 @@ usage: multibuild.sh [-48abfhmnq] [-s SUFFIX]
   -h         Print this help message
   -m         Enable mini build (default: no)
   -n         Dry run, print commands but do nothing
+  -O         Compact with advzip (default: no, less compatible)
   -s SUFFIX  Append a version suffix (e.g. "-s -1.2.3", default:auto)
-  -q         Quick: do no compact with advzip (default: auto)
 EOF
 }
 
@@ -40,8 +40,8 @@ while getopts 48abfhmnqs: opt; do
         h) usage; exit 0;;
         m) flavors="$flavors -mini";;
         n) dryrun=echo;;
+        O) compact=yes;;
         s) suffix="$OPTARG";;
-        q) compact=no;;
         ?) usage >&2; exit 1;;
     esac
 done
@@ -53,12 +53,6 @@ if [ $# -gt 0 ]; then
     exit 1
 fi
 
-if [ $compact = auto ] && command -v advzip >/dev/null 2>&1; then
-    compact=yes
-else
-    compact=no
-fi
-
 if [ -z "$arch" ]; then
     arch="w64devkit"
 fi