CI: add a UWP x86_64 libvlc target

extras/ci/gitlab-ci.yml

@@ -15,6 +15,7 @@ variables:
     VLC_WIN32_IMAGE: registry.videolan.org/vlc-debian-win32:20200602191827
     VLC_WIN64_IMAGE: registry.videolan.org/vlc-debian-win64:20200602185103
     VLC_WIN_LLVM_IMAGE: registry.videolan.org/vlc-debian-llvm-mingw:20200603153044
+    VLC_UWP_LLVM_IMAGE: registry.videolan.org/vlc-debian-llvm-uwp:20200603145315
     VLC_DEBIAN_IMAGE: registry.videolan.org/vlc-debian-unstable:20200229201904
     VLC_ANDROID_IMAGE: registry.videolan.org/vlc-debian-android:20190717134531
     VLC_SNAP_IMAGE: registry.videolan.org/vlc-ubuntu-bionic:20190627090437
@@ -113,9 +114,9 @@ variables:
         fi
         if [ -n "$VLC_PREBUILT_CONTRIBS_URL" ]; then
             echo "Building using prebuilt contribs at $VLC_PREBUILT_CONTRIBS_URL"
-            extras/package/win32/build.sh -p -a $HOST_ARCH $NIGHTLY_EXTRA_BUILD_FLAGS
+            extras/package/win32/build.sh -p -a $HOST_ARCH $NIGHTLY_EXTRA_BUILD_FLAGS $LIBVLC_EXTRA_BUILD_FLAGS $UWP_EXTRA_BUILD_FLAGS
         else
-            extras/package/win32/build.sh -c -a $HOST_ARCH $NIGHTLY_EXTRA_BUILD_FLAGS
+            extras/package/win32/build.sh -c -a $HOST_ARCH $NIGHTLY_EXTRA_BUILD_FLAGS $LIBVLC_EXTRA_BUILD_FLAGS $UWP_EXTRA_BUILD_FLAGS
         fi
 
 win32:
@@ -136,6 +137,15 @@ win64-llvm:
         name: $VLC_WIN_LLVM_IMAGE
     variables: *variables-win64-llvm
 
+uwp64-libvlc-llvm:
+    extends: .win-common
+    image:
+        name: $VLC_UWP_LLVM_IMAGE
+    variables:
+        <<: *variables-win64
+        LIBVLC_EXTRA_BUILD_FLAGS: -z
+        UWP_EXTRA_BUILD_FLAGS: -u -w -x
+
 .nightly-win-common:
     extends: .win-common
     only: