Log Message:
If we really need GNU M4 (and we appear to do) for this package,
use USE_TOOLS+= gm4:run instead of m4:run.
With our own m4 on NetBSD, the -d flag in the m4 invocation "eats"
the following -I<path> argument, so m4 won't find its own files,
and there may be other dependencies on GNU M4.

Bump PKGREVISION, since this is a bugfix.