[PATCH] [libcxx] Set _LIBCPP_ELAST for mingw.

[Marshall Clow]

Other than that - this looks good to me.

Has anyone tried this on FreeBSD?


================
Comment at: src/system_error.cpp:11
@@ -10,3 +10,3 @@
 #define _LIBCPP_BUILDING_SYSTEM_ERROR
-#include "__config"
 #include "system_error"
+
----------------
Please always include `<__config>` first.

This is a convention, rather than a requirement, since the first thing that `<system_error>` does is include `<__config>`

http://reviews.llvm.org/D6558

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