split PLATFORM_CFLAGS into PLATFORM_CXXFLAGS to avoid compile errors on .c files #6625
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Similar to this: #5445
When your project contains .c files, the of makefile currently passes the -std=c++11 to the compiler, which throws an error.
This wasn't a problem when using GCC, but it is when trying to use on CLANG.
Using the same strategy as mentioned on the issue above fixed the problem.