package/macosx: use the same minimum version as the other scripts

The value is grabbed when calling env.build.sh.

(cherry picked from commit d6a636de20) (edited)
- 3.0 had the minimum to 10.7
- 4.0 also disabled x

extras/package/macosx/configure.sh

@@ -23,7 +23,7 @@ OPTIONS="
         --disable-pulse
         --disable-sdl-image
         --disable-vnc
-        --with-macosx-version-min=10.7
+        --with-macosx-version-min=$MINIMAL_OSX_VERSION
 "
 
 export CFLAGS