[PATCH] Allow using ANSI escape sequences on Windows

[Nico Rieck]

Hi,

with ConEmu [1] or ANSICON [2] it is possible to use ANSI escape 
sequences for colors on Windows. This way colored output can be provided 
even when the normal console api cannot be used, e.g. when clang is used 
with ninja.

I don't know of any simple way to detect either of the mentioned hacks 
so for now the environment variable "LLVM_FORCE_ANSI_COLORS" can be set 
to force this behavior.

-Nico

[1] http://code.google.com/p/conemu-maximus5/
[2] https://github.com/adoxa/ansicon
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