[PATCH] [libcxxabi] Add a cmake build system.

[Jon Roelofs]

================
Comment at: CMakeLists.txt:60
@@ +59,3 @@
+  set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+  set(PACKAGE_BUGREPORT "llvmbugs at cs.uiuc.edu")
+
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BUG_REPORT_URL is used elsewhere in the llvm family... will that work here, rather than the hardcoded string?

http://reviews.llvm.org/D4359