Set a default target in wrapper scripts and executables

wrappers/windres-wrapper.sh

@@ -88,6 +88,10 @@ CODEPAGE=1252
 CPP_OPTIONS=
 BASENAME="$(basename "$0")"
 TARGET="${BASENAME%-*}"
+DEFAULT_TARGET=x86_64-w64-mingw32
+if [ "$TARGET" = "$BASENAME" ]; then
+    TARGET=$DEFAULT_TARGET
+fi
 PROG="$BASENAME"
 
 while [ $# != 0 ]; do