bashrc: Add ggh to grep through only .h files
bashrc: Add ggh to grep through only .h files

Often handy to find something declared in a header file, when grepping
through every file would take to long or turn up irrelevant results.

DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk