ci: Include enough Android headers to let us compile test EGL

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6112>

bin/update-android-headers.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+set -eu
+
+if [ ! -e .git ]; then
+    echo must run from top-level directory;
+    exit 1
+fi
+
+if [ ! -d platform-hardware-libhardware ]; then
+    git clone --depth 1 https://android.googlesource.com/platform/hardware/libhardware platform-hardware-libhardware
+    git clone --depth 1 https://android.googlesource.com/platform/system/core platform-system-core
+    git clone --depth 1 https://android.googlesource.com/platform/frameworks/native platform-frameworks-native
+fi
+
+dest=include/android_stub
+
+rm -rf ${dest}
+mkdir ${dest}
+
+
+# These directories contains mostly only the files we need, so copy wholesale
+
+cp -av platform-frameworks-native/libs/nativewindow/include/vndk        \
+    platform-system-core/libsync/include/sync                           \
+    platform-system-core/libsync/include/ndk                            \
+    platform-system-core/libbacktrace/include/backtrace                 \
+    platform-system-core/libsystem/include/system                       \
+    platform-system-core/liblog/include/log                             \
+    platform-frameworks-native/libs/nativewindow/include/system         \
+    platform-frameworks-native/libs/nativebase/include/nativebase       \
+    ${dest}
+
+
+# We only need a few files from these big directories so just copy those
+
+mkdir ${dest}/hardware
+cp -av platform-hardware-libhardware/include/hardware/{hardware,gralloc,fb}.h ${dest}/hardware
+cp -av platform-frameworks-native/vulkan/include/hardware/hwvulkan.h ${dest}/hardware
+
+mkdir ${dest}/cutils
+cp -av platform-system-core/libcutils/include/cutils/{log,native_handle,properties}.h ${dest}/cutils
+
+
+# include/android has files from a few different projects
+
+mkdir ${dest}/android
+cp -av platform-frameworks-native/libs/nativewindow/include/android/*   \
+    platform-frameworks-native/libs/arect/include/android/*             \
+    platform-system-core/liblog/include/android/*                       \
+    platform-system-core/libsync/include/android/*                      \
+    ${dest}/android
+