ld: don't chance overrunning PE .reloc section content

ld: don't chance overrunning PE .reloc section content

The allocation of reloc_d doesn't take reloc_s->size into account. There
is already padding being emitted up to the allocated size. While
reloc_s->size ought to still be zero at this point anyway (and hence the
code being deleted would have been just dead), don't risk writing past
the actual allocation.