PR15802 Windows paths with trailing backslashes

[Nikola Smiljanic]

Here's a patch that tries to solve
http://llvm.org/bugs/show_bug.cgi?id=15802 The bug report contains a patch
that doesn't conform to coding standards and doesn't solve the general
issue. Basically backslashes must be escaped if they are followed by a
double quote, or in our case if they appear at the end of the argument
because clang puts quotes around every argument containing a backslash
which creates the backslashes followed by a double quote situation. The
solution is quadratic in nature but I don't think this makes a difference
as such input isn't something we should be seeing. I tried to solve this
with as little modifications to the existing code as possible.

More info on the crazy rules here
http://msdn.microsoft.com/en-us/library/bb776391%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
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