groff - horrible hack to fix .gz issues
* If a gzipped manual page contains a .so forwarding entry, groff
will attempt to open the forwarding entry directly and will not
check to see if a file with a .gz extension is present, resulting
in an open error.
* Hack hack hack. Horrible hack of the input search path to check
for a .gz extension and popen() the file with zcat. Horrible because
I haven't bothered to modify all the other myrid code to properly call
pclose() instead of fclose() in that case.