.github: build drivers against xorg-sdk without actual Xserver compile

Use the new xorg-sdk build type instead of building a complete Xserver,
to compile our drivers against.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

.github/scripts/install-prereq-drivers.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+. .github/scripts/util.sh
+
+mkdir -p $X11_BUILD_DIR
+cd $X11_BUILD_DIR
+
+if [ "$X11_OS" = "Linux" ]; then
+build_meson   drm               $(fdo_mirror drm)                          libdrm-2.4.121   -Domap=enabled -Dfreedreno=enabled
+fi
+build_meson   xorgproto         $(fdo_mirror xorgproto)                    xorgproto-2024.1

.github/scripts/ubuntu/install-pkg.sh

@@ -91,4 +91,5 @@ apt-get install -y \
 	xkb-data \
 	xutils-dev \
 	libxaw7-dev \
-	python3-mako
+	python3-mako \
+	libxcvt-dev