Add x264 test script

scripts.d/50-x264.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+X264_REPO="https://code.videolan.org/videolan/x264.git"
+X264_COMMIT="db0d417728460c647ed4a847222a535b00d3dbcb"
+
+ffbuild_relevant() {
+    [[ $VARIANT == gpl ]] || return -1
+    return 0
+}
+
+ffbuild_dockerstage() {
+    to_df "ADD $SELF /root/x264.sh"
+    to_df "RUN bash -c 'source /root/x264.sh && ffbuild_dockerbuild'"
+}
+
+ffbuild_dockerbuild() {
+    git clone "$X264_REPO" x264 || return -1
+    pushd x264
+    git checkout "$X264_COMMIT" || return -1
+
+    if [[ $TARGET == win64 ]]; then
+        ./configure --disable-cli --enable-static --enable-pic \
+                    --disable-lavf --disable-swscale \
+                    --host=x86_64-w64-mingw32 --cross-prefix=x86_64-w64-mingw32- \
+                    --prefix="$FFPREFIX" || return -1
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    make -j$(nproc) || return -1
+    make install || return -1
+
+    popd
+    rm -rf x264
+}