Some ELF ABIs still require a PLT that is both writable and executable. To

avoid W^X violations, initially map such segments as writable and
non-executable, and change the mapping to non-writable and executable
after initial relocation processing.  As a side-benefit this means we no
longer depend on the __plt_start and __plt_end to make the PLT read-only
after relocation processing.

This will break binaries linked with ld -Z, most notably emacs, on some
of our architectures.

ok deraadt@, guenther@

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