Add experimental libva/vaapi support

scripts.d/50-vaapi/40-libdrm.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+LIBDRM_REPO="https://gitlab.freedesktop.org/mesa/drm.git"
+LIBDRM_COMMIT="9cef5dee3cd817728c83aeb3c2010c1954e4c402"
+
+ffbuild_enabled() {
+    [[ $TARGET != linux* ]] && return -1
+    return 0
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$LIBDRM_REPO" "$LIBDRM_COMMIT" libdrm
+    cd libdrm
+
+    mkdir build && cd build
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        -Ddefault_library=static
+        -Dlibkms=false
+        -Dudev=false
+        -Dcairo-tests=false
+        -Dvalgrind=false
+        -Dexynos=false
+        -Dfreedreno=false
+        -Domap=false
+        -Detnaviv=false
+        -Dintel=true
+        -Dnouveau=true
+        -Dradeon=true
+        -Damdgpu=true
+    )
+
+    if [[ $TARGET == linux* ]]; then
+        myconf+=(
+            --cross-file=/cross.meson
+        )
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    meson "${myconf[@]}" ..
+    ninja -j$(nproc)
+    ninja install
+}
+
+ffbuild_configure() {
+    echo --enable-libdrm
+}
+
+ffbuild_unconfigure() {
+    echo --disable-libdrm
+}