xzgv extension for TC 14 x86_64

* Install extensions:  compiletc squashfs-tools gtk2-dev libexif-dev
* Edit config.mk:
CFLAGS="-mtune=generic -Os -pipe"
PREFIX=/tmp/xzgv/usr/local

* make
* src/xzgv

* sudo mkdir -p /tmp/xzgv/usr/local/share/applications  /tmp/xzgv/usr/local/share/pixmaps  /tmp/xzgv/usr/local/share/app-install/desktop  /tmp/xzgv/usr/local/share/man/man1
* sudo make install
* sudo strip /tmp/xzgv/usr/local/bin/xzgv
* split /tmp/xzgv into directories:  xzgv-dev xzgv-doc

* sudo chown -R root:root xzgv*
* In each dir. run "find usr ! -type d | sed "s/^/\//g" > ../xzgv.tcz.list".
 - for dir in `find -maxdepth 1 -mindepth 1 -type d`; do cd $dir; find usr ! -type d | sed "s/^/\//g" > ../$dir.tcz.list; cd ..; done
* Make into extensions using mksquashfs. "mksquashfs xzgv xzgv.tcz
  "md5sum xzgv.tcz > xzgv.tcz.md5.txt" etc...
 - for dir in `find -maxdepth 1 -mindepth 1 -type d`; do mksquashfs $dir ${dir#./}.tcz; md5sum ${dir#./}.tcz > ${dir#./}.tcz.md5.txt; done
* Make xzgv.tcz.dep:

$ ldd /tmp/xzgv/usr/local/bin/xzgv

Deps:
gtk2.tcz
libexif.tcz
Xorg-fonts.tcz

* Copy xzgv.tcz (+ dep, md5) to "tce/optional".
* tce-load -i xzgv
* xzgv &