freetype: upgrade 2.13.0 -> 2.13.1

Changelog:
===========
* docs/VERSION.TXT: Add entry for version 2.13.1.
* docs/CHANGES: Updated.
* docs/release, docs/README, builds/macs/README: Updated.
* README, src/base/ftver.rc, builds/windows/vc2010/index.html,
builds/windows/visualc/index.html, builds/windows/visualce/index.html,
builds/wince/vc2005-ce/index.html, builds/wince/vc2008-ce/index.html,
docs/freetype-config.1: s/2.13.0/2.13/1/, s/2130/2131/.
* include/freetype/freetype.h (FREETYPE_PATCH): Set to 1.
* builds/unix/configure.raw (version_info): Set to 26:0:20.
* CMakeLists.txt (VERSION_PATCH): Set to 1.
* subprojects/libpng.wrap, subprojects/zlib.wrap, subprojects/dlg: Updated.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4447b2db)
Signed-off-by: Steve Sakoman <steve@sakoman.com>