[4.2, cft, aix, hpux] fix pr 26090

[Steve Ellcey]

> > I assume this should be:
> > 
> > #undef  TARGET_ASM_RELOC_RW_MASK
> > #define TARGET_ASM_RELOC_RW_MASK  ia64_hpux_reloc_rw_mask
> 
> Yes, and I found I missed declaring those new functions at the
> top of  ia64.c too.
> 
> r~

Yes, with both those changes the bootstrap on HP-UX seems to be
proceeding fine.

Steve