Warning flags for compatibility with clang.

[Pedro Giffuni]

Hello;

FWIW, I have been looking at some changes from Apple's GCC and these two 
small changes should be interesting to have in the official gcc.

Implement -Wmost for compatibility with clang.
http://svnweb.freebsd.org/base?view=revision&revision=259920

Add Apple compatible -Wnewline-eof
http://svnweb.freebsd.org/base?view=revision&revision=259555

I don't own them but I doubt any of them is copyrightable. Perhaps they 
are available in the old Apple branches that the FSF has control of.

Regards,

Pedro.