Provide the missing fabsl alias to fabs.

No shlib_version change needed, jumping on the version bump of the mkdtems
addition.

Stop exporting the internal _mcount symbol as that's only referenced
by the ASM stub, which is also in libc. The compiler only generates
invocations of the latter.

ok mpi@ deraadt@ kettenis@

m88k switched to RELRO

Between relro and previous RWX work, the __{got,plt}_{start,end} symbols
are no longer needed by ld.so. Move them to the m88k-specific list, as
it hasn't made the jump.

ok deraadt@

Sync with other per-arch Symbols.list files

catch up