Time to enable partial relro

[Pedro Giffuni]

Hello;

GNU RELRO support was committed in r230784 (2012-01-30) but we never 
enabled it by default.

There was some discussion about it on
https://reviews.freebsd.org/D3001

By now, all Linux distributions, NetBSD and DragonFly support it and
it is the default for most systems in binutils 2.27.

This doesn't affect performance, I ran it through an exp-run last
year, no other OS has had issues etc ... seems safe and can be
disabled if needed when linking.

I think it's time to enable it be default in our base binutils. If
there are no objections, I will just commit the attached patch over
the weekend.

Regards,

Pedro.
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