[PATCH] Rename *.c to *.cpp to generate unwind tables for these functions.

[Logan Chien]

I am using `cmake` and `clang 3.5`.

An alternative solution is to add `-funwind-tables` to CFLAGS.

I guess that it is due to the fact that these C functions are considered as `nothrow`.


http://reviews.llvm.org/D7033

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