Per-arch CFLAGS

[Ian Lepore]

I've run into a situation where I need to pass architecture specific
CFLAGS to the world stage of a cross-build but not have those flags in
effect for the build-tools and cross-tools that run on the build host. 

I tried several things based on $TARGET_ARCH and manipulating the
environment in Makefile.inc1 but everything I tried either didn't work
or had unhappy side effects such as overriding automatically-supplied
internal flags with the user-supplied flags, usually resulting in build
failure because some crucial CPUTYPE stuff would be missing.

After consulting with Warner a bit I came up with the attached rather
simple change that does the job perfectly.  It adds support for a
CFLAGS.arch variable that can be set in make.conf or the command line or
environment.  Any objections to this?

-- Ian

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