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

[Dmitri Gribenko]

  @chapuni: This patch will probably also have the same effect as r196859, which was reverted.  I don't have a Windows machine and I am not sure how to fix the failing test (Misc/remap-file.c) -- http://bb.pgr.jp/builders/cmake-clang-i686-mingw32/builds/6254/steps/test-clang/logs/Clang%20%3A%3A%20Misc__remap-file.c

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