-Mark it as INGORE on FreeBSD 4.x.
-Disable the x11-toolkits/ruby-gtkglext depend on FreeBSD 4.x.
The issue is that the ruby can't be mix with and without threads (libc and
libc_r) in the same place on FreeBSD 4.x. FreeBSD 5.x doesn't has any of
Approved by: adamw (mentor)
Discussed with: knu