Update thaixfonts to 1.2.6.

Version 1.2.6 (2013-10-22)
=============
- Updated build system.
- Switch to .tar.xz release tarball.
Updated fonts/thaixfonts to 1.2.6
Import gmic-1.5.9.3 as graphics/gmic.

G'MIC is an open and full-featured framework for image processing,
providing several different user interfaces to
convert/manipulate/filter/visualize generic image datasets, from
1d scalar signals to 3d+t sequences of multi-spectral volumetric
images.

The package contains a command line tool and a gimp plugin.
+ gmic.
Added graphics/gmic version 1.5.9.3
Make "make package" as an unprivileged user work by avoiding mode 111
on binaries. While there, make the modes more conventional (755) overall.
Tricky tricky Makefile here. Add some clarification for future reference.
Bump PKGREVISION due to binary package change in previous commit (modes).