add m4 files to those searched by gsource
add m4 files to those searched by gsource

darcs-hash:20080319210920-1a7c6-5bce4580a8e78f6fc3eed5ce6b0d5d14bcc23f51

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc