Allow nonstandard compilation of .c files by c++ compiler.
It can break any time again and it is not supported to do so.
Use C compiler for C files and C++ compiler for C++ files to be safe.
Coverage: 92.602% (+0.008%) from 92.594% when pulling 6ae1b9875e0b804eabdeb10fda23fd8db5fc9f1c on issue/117-allow-compilation-by-cxx into fbf362250c7c3984834eb67d4a69e40ed28293db on master.
Fixes: #117
Allow nonstandard compilation of
.c
files byc++
compiler. It can break any time again and it is not supported to do so. Use C compiler for C files and C++ compiler for C++ files to be safe.