Re-Organize Vulkan build order a bit

scripts.d/50-vulkan/50-glslang.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+GLSLANG_REPO="https://github.com/KhronosGroup/glslang.git"
+GLSLANG_COMMIT="d1608ab1ef17f1488bdcbfe11f2c3c96ac482fce"
+
+ffbuild_enabled() {
+    [[ $ADDINS_STR == *4.4* ]] && return -1
+    return 0
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$GLSLANG_REPO" "$GLSLANG_COMMIT" glslang
+    cd glslang
+
+    python3 ./update_glslang_sources.py
+
+    mkdir build && cd build
+
+    cmake -DCMAKE_TOOLCHAIN_FILE="$FFBUILD_CMAKE_TOOLCHAIN" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$FFBUILD_PREFIX" \
+        -DBUILD_SHARED_LIBS=OFF -DBUILD_EXTERNAL=ON -DBUILD_TESTING=OFF -DENABLE_CTEST=OFF \
+        -DENABLE_OPT=ON -DENABLE_HLSL=ON -DENABLE_GLSLANG_BINARIES=OFF ..
+    make -j$(nproc)
+    make install
+}
+
+ffbuild_configure() {
+    echo --enable-libglslang
+}
+
+ffbuild_unconfigure() {
+    echo --disable-libglslang
+}