yopts: Add ability to compile and run parser

The generated .c file can be compiled with -DYDEBUG option and
then launched with options.

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>
yoda: Don't generate short rover equal to '?'

This is getopt_long ret code for unknown option.

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>