Detect FreeBSD versions, moved to freebsd3-gcc

build/platforms/freebsd-gcc/Make-platform

-#
-# LDAP FreeBSD GNU C Make-platform file
-#
-
-
-#
-# add any platform-specific overrides below here
-#
-
-#
-# -------------------------------------------------------------------------
-# you will probably not need to edit anything below this point
-# -------------------------------------------------------------------------
-CC	= gcc
-
-PLATFORMCFLAGS=	-Dfreebsd