[cfe-commits] PATCH: Add -Wreturn-type-c-linkage

[Matt Beaumont-Gay]

The new "your 'extern "C" function is returning a non-POD type'"
warning fires on a lot of code which we would like to continue
building with -Werror=return-type. This patch gives the new warning
its own flag so it can be selectively disabled.

-Matt
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