Correctly determine HOSTCC and HOSTCFLAGS (from host make)
and pass them as CC/CFLAGS to the toolchain as well.
Now this at least goes as far as I suspected the first
breakage would be (on MirBSD) - autotools.
Detecting works by invoking $(MAKE) with a BSD-specific
makefile and just using $(HOSTCFLAGS) if that fails.
This works better on OpenBSD too, FWIW.
git-svn-id: svn://www.freewrt.org/trunk/freewrt@54 afb5a338-a214-0410-bd46-81f09a774fd1