configure: rework parsing --cpu arguments to support all features unless blacklisted

Keeping an ever growing list of CPUs just to pass -march to the compiler and
enable fast_cmov is a waste of time. Every CPU we know has limitations is
already handled here, so just fallback to enabling everything when a passed in
argument is not one of those.

This will enable optimizations for CPU architectures released in the past 7 or
so years with supported GCC and clang compilers when used as argument in
configure, instead of silently ignoring them.

Signed-off-by: James Almer <jamrial@gmail.com>

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