[PATCH] [libcxxabi] Teach CMake better ways to find the libc++ source directory (and misc cleanup).

[Dan Albert]

LGTM.


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Comment at: www/index.html:94
@@ +93,3 @@
+  <li>
+    Check out the <a href="http://libcxx.llvm.org">libcxx source</a> tree.
+  </li>
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We should start adding id tags to our sections so we can link them directly (not this patch, obviously, just worth mentioning).

http://reviews.llvm.org/D7130

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