package/win32: build.sh: enable debug/disable optimization in debug builds

the --disable-optim flag is used for both. Debug builds should have debug so
should enable this option (until/if we split the option to enable/disable debug
and enable/disable optimization).

extras/package/win32/build.sh

@@ -139,6 +139,9 @@ fi
 if [ ! -z "$BREAKPAD" ]; then
      CONTRIBFLAGS="$CONTRIBFLAGS --enable-breakpad"
 fi
+if [ "$RELEASE" != "yes" ]; then
+     CONTRIBFLAGS="$CONTRIBFLAGS --disable-optim"
+fi
 ../bootstrap --host=$TRIPLET $CONTRIBFLAGS
 
 # Rebuild the contribs or use the prebuilt ones