[PATCH] Fix "modular" import when we find the header in the current directory

[Dmitri Gribenko]

  @chapuni: As a different option, are you OK with XFAIL'ing this test on Windows for now?  This test is for file remapping functionality, which is used in libclang.  But in libclang it is used with memory buffers, not with real files, so I don't think the actual use case will break on Windows.

http://llvm-reviews.chandlerc.com/D2374