Misa f6d7a214f8 CMake: Add workaround for setting -std= below 3.1.3 ...

Previously, if the user had a CMake version below 3.1.3, we told them to
set `-std` themselves.

However, we are going to go to C99 soon (because of FAudio, see #869),
and CentOS 7's CMake is too old to set `-std=` automatically, defaulting
to C90. This is bad because it fails the CI.

To work around this, we set `-std=` ourselves, but first we have to
clear any existing `-std=` flag in C_FLAGS or CXX_FLAGS. Amusingly
enough, MSVC does not have `/std:` switches for either C90 or C++98, so
we just get to do nothing.

2022-03-21 20:13:08 -07:00

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