[PATCH] Improve #pragma comment(lib) support

[Aaron Ballman]

One of the things comment(lib) does in MSVC is automatically suffix
the argument with ".lib" if needs be.  This patch implements the same
logic, which allows us to properly link libraries such as ones
provided by the MSDN examples
(http://msdn.microsoft.com/en-us/library/7f0aews7(v=vs.80).aspx).

~Aaron
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