Re-Organize Vulkan build order a bit

scripts.d/50-vulkan/45-vulkan.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+HEADERS_REPO="https://github.com/KhronosGroup/Vulkan-Headers.git"
+HEADERS_VERSION="1.2.198"
+
+ffbuild_enabled() {
+    [[ $ADDINS_STR == *4.4* ]] && return -1
+    return 0
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$HEADERS_REPO" "v$HEADERS_VERSION" vkheaders
+    cd vkheaders
+
+    mkdir build && cd build
+
+    cmake -DCMAKE_TOOLCHAIN_FILE="$FFBUILD_CMAKE_TOOLCHAIN" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$FFBUILD_PREFIX" ..
+    make -j$(nproc)
+    make install
+
+    cat >"$FFBUILD_PREFIX"/lib/pkgconfig/vulkan.pc <<EOF
+prefix=$FFBUILD_PREFIX
+includedir=\${prefix}/include
+
+Name: vulkan
+Version: $HEADERS_VERSION
+Description: Vulkan (Headers Only)
+Cflags: -I\${includedir}
+EOF
+}
+
+ffbuild_configure() {
+    echo --enable-vulkan
+}
+
+ffbuild_unconfigure() {
+    echo --disable-vulkan
+}