Fixed libxcb's xcb.pc to not hide important depedencies (like xau) from pkg-config

xorg/libxcb/xcb.pc.patch

@@ -0,0 +1,27 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: package/.../libxcb/xcb.pc.patch
+# Copyright (C) 2008 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This patch file is dual-licensed. It is available under the license the
+# patched project is licensed under, as long as it is an OpenSource license
+# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
+# of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+--- ./xcb.pc.in.orig	2008-02-28 16:32:58.000000000 +0000
++++ ./xcb.pc.in	2008-02-28 16:33:11.000000000 +0000
+@@ -6,7 +6,7 @@
+ Name: XCB
+ Description: X-protocol C Binding
+ Version: @PACKAGE_VERSION@
+-Requires.private: @NEEDED@
++Requires: @NEEDED@
+ Libs: -L${libdir} -lxcb
+ Libs.private: @LIBS@
+ Cflags: -I${includedir}