xwm: Reparent X windows, paint a red decoration frame

It's red, and that's about it.
diff --git a/configure.ac b/configure.ac
index 9a029f1..748115e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@
 	      enable_xserver_launcher=yes)
 AM_CONDITIONAL(ENABLE_XSERVER_LAUNCHER, test x$enable_xserver_launcher = xyes)
 if test x$enable_xserver_launcher = xyes; then
-  PKG_CHECK_MODULES([XSERVER_LAUNCHER], xcb xcb-xfixes)
+  PKG_CHECK_MODULES([XSERVER_LAUNCHER], xcb xcb-xfixes cairo-xcb)
   AC_DEFINE([BUILD_XSERVER_LAUNCHER], [1], [Build the X server launcher])
 
   AC_ARG_WITH(xserver-path, AS_HELP_STRING([--with-xserver-path=PATH],