sync code with last improvements from OpenBSD

xserver/composite/meson.build

@@ -0,0 +1,21 @@
+srcs_composite = [
+	'compalloc.c',
+	'compext.c',
+	'compinit.c',
+	'compoverlay.c',
+	'compwindow.c',
+]
+
+hdrs_composite = [
+	'compositeext.h',
+]
+
+libxserver_composite = static_library('libxserver_composite',
+	srcs_composite,
+	include_directories: inc,
+	dependencies: common_dep,
+)
+
+if build_xorg
+    install_data(hdrs_composite, install_dir: xorgsdkdir)
+endif