Stopping GAS from resolving IFUNC symbols itself

[Richard Sandiford]

Richard Sandiford <richard.sandiford@linaro.org> writes:
> I'm going through your list of test targets just to be sure.
> I've got up to ia64-elf so far, and everything seems happy.
> I'll test the rest overnight.

No failures on Alan's Big List Of Targets, so I went ahead and
applied it.  Please shout if something goes wrong though.

Richard