[patch] Add support for gcc's spelling of fcolor-diagnostics

[Nico Weber]

Hi,

gcc recently added colored diagnostics [1]. Their flag to control it is
slightly different from clangs, thereby making it obvious that they
independently discovered this concept and weren't influenced by clang at
all.

The attached patch lets clang understand gcc's spelling of the flag as well.

Ok?

Nico

1:
http://gcc.gnu.org/onlinedocs/gcc/Language-Independent-Options.html
http://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;a=commitdiff;h=adc604d41825b3cbd09045baeef09b1b88fc5a02
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