[toplevel] PR/18222 Fix definition of target's CPPFLAGS

[Kelley Cook]

[I forgot to attach patch 1st time]

CPPFLAGS should only have items that pertain to the preprocessor.

This patch

http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01736.html

changed it to have all of CFLAGS, which was causing bootstrap problems
as CPPFLAGS is precious according to autoconf and was getting redefined.

This adds in a new overrideable CPPFLAGS_FOR_TARGET, which will
hopefully fulfill Sean's purpose for his original patch.

Although I don't have an Alpha to test on, I think this should eliminate
the bootstrap problem for PR/18222.  Regardless the current definition
of the target's CPPFLAGS is clearly incorrect.

Bootstrapped i686-pc-cygwin

OK to install?

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