getopt.h, getopt.c, getopt1.c are from glibc-2.1.2

The getopt functions are included because
a lot of platforms do not have getopt
functions for processing long options.
Some platforms (VC,MINGW32) don't have
the getopt function that processes single
letter options.

getopt.h was renamed to gg-getopt.h to avoid
conflicts with system provided getopt.h
files.

Function getopt was renamed to gg_getopt to
avoid conflicts with the system provided getopt
function.
