Remove unused Symbol.map files.

Remove $ARCH/openlibm_fenv.h.

It seems I accidentally copied these headers twice in
d07820351bed7d16f1f0a1ae0596a2e2b6f50aaf. We should only have them in
include/.

Rename the fenv headers.

I guess the idea would be to eventually also install all of the
openlibm*.h headers, instead of just openlibm.h. Make openlibm_fenv.h
suitable for this purpose by moving all

Rename the fenv headers.

I guess the idea would be to eventually also install all of the
openlibm*.h headers, instead of just openlibm.h. Make openlibm_fenv.h
suitable for this purpose by moving all of the $ARCH/fenv.h headers next
to it.

We actually need this change to make OPENLIBM_USE_HOST_FENV_H work.
Right now it's still broken, because the "#include <fenv.h>" performed
by openlibm_fenv.h still pulls in $ARCH/fenv.h as $ARCH/ is added to the
compiler include path.

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Rename include/fenv.h to <openlibm_fenv.h>.

OpenLibm has an implementation of fenv.h internally. This may be
problematic in case you want it to build against the host system's
implementation, as it

Rename include/fenv.h to <openlibm_fenv.h>.

OpenLibm has an implementation of fenv.h internally. This may be
problematic in case you want it to build against the host system's
implementation, as it would require you to somehow take the fenv.h file
out of the compiler search path.

Simply use a different naming scheme, similar to openlibm.h and
openlibm_complex.h. If we want to build against the host's fenv.h, we
can simply add an '#include <fenv.h>' from within this header.

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Use uint32_t on ARM, not non-standard __uint32_t

Fixed build on ARM

Removed all long double support, since ARM doesn't have long doubles.

Add Make.files for all architectures.

Import entire msun from FreeBSD.