CI: Install DirectX-Headers package for x86 container

Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8251>

.gitlab-ci.yml

@@ -277,7 +277,7 @@ x86_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &x86_build "2020-12-17-use-ephemeral"
+    MESA_IMAGE_TAG: &x86_build "2021-1-4-directx-headers"
 
 .use-x86_build:
   variables:

.gitlab-ci/container/x86_build.sh

@@ -117,6 +117,15 @@ cd shader-db
 make
 popd
 
+git clone https://github.com/microsoft/DirectX-Headers -b v1.0.1 --depth 1
+pushd DirectX-Headers
+mkdir build
+cd build
+meson .. --backend=ninja --buildtype=release -Dbuild-test=false
+ninja
+ninja install
+popd
+rm -rf DirectX-Headers
 
 ############### Uninstall the build software