Use global GOT type to determine GOT action

Use global GOT type to determine GOT action

morello-binutils: Use global GOT type to determine GOT action

In final_link_relocate we currently use whether the relocation we're
looking at is a Morello relocation to decide whether we should treat the
GOT entry as a Morello GOT entry or not.

This is problematic since we can have an AArch64 relocation against a
capability GOT entry (even if it isn't a very useful thing to have).

The current patch decides whether we need to emit a MORELLO RELATIVE
relocation in the GOT based on whether the GOT as a whole contains
capabilities rather than based on whether the first relocation against
this GOT is a Morello relocation.

Until now we did not see any problem from this.  Here we add a testcase
that triggers the problem.