[Patch] Fix clang-rename Unit Test

[Xin Hwang]

Hi,

I noticed the clang-rename unit test has failed compilation and been
excluded. I've made a fix to make it compile, and all the tests are
running okay on my laptop.
This patch separated the clangRename.a and clang-rename application,
allowing the unit test to link to clangRename.a.
Please help review the patch. Thanks!

Regards
Xin Huang
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