macosx: Really use specified SDK in build.sh

Sets the SDK in addition to minimum deployment target.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit f89d9b2f571c7cff7ce63881ce575090dffb8fbd)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/package/macosx/build.sh

@@ -138,7 +138,8 @@ if [ "${vlcroot}/configure" -nt Makefile ]; then
   ${vlcroot}/extras/package/macosx/configure.sh \
       --build=$TRIPLET \
       --host=$TRIPLET \
-      --with-macosx-version-min=$OSX_VERSION > $out
+      --with-macosx-version-min=$OSX_VERSION \
+      --with-macosx-sdk=/Developer/SDKs/MacOSX$OSX_VERSION.sdk > $out
 fi