Check for libavutil/hwcontext_drm.h

This is an optional feature of libavutil, so this will cause a build
failure if it's not present (e.g. on Debian/Ubuntu).

examples/meson.build

@@ -5,6 +5,10 @@ libavutil = dependency('libavutil', required: false)
 libavcodec = dependency('libavcodec', required: false)
 libavformat = dependency('libavformat', required: false)
 
+if not cc.has_header('libavutil/hwcontext_drm.h', dependencies: libavutil)
+    libavutil = disabler()
+endif
+
 executable('simple', 'simple.c', dependencies: wlroots)
 executable('pointer', 'pointer.c', dependencies: wlroots)
 executable('touch', 'touch.c', 'cat.c', dependencies: wlroots)

meson.build

@@ -3,7 +3,7 @@ project(
 	'c',
 	version: '0.0.1',
 	license: 'MIT',
-	meson_version: '>=0.43.0',
+	meson_version: '>=0.44.0',
 	default_options: [
 		'c_std=c11',
 		'warning_level=2',