[binutils-gdb] Make powerpc bfd ld reloc overflow vs undefined symbols match gold

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 8131c12209700f6e8cf16b09b5196da78a8066a3 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: 8131c12209700f6e8cf16b09b5196da78a8066a3

Make powerpc bfd ld reloc overflow vs undefined symbols match gold
	* elf64-ppc.c (ppc64_elf_relocate_section): Report overflow to
	stubs, even those for undefined weak symbols.  Otherwise, don't
	report relocation overflow on branches to undefined strong
	symbols.  Fix memory leak.
	* elf32-ppc.c (ppc_elf_relocate_section): Don't report relocation
	overflow on branches to undefined strong symbols.