Fix PowerPC64 ELFv2 icf_safe failures

ELFv2 doesn't use .opd, so folding function code can't be allowed
in safe mode if a function's address might be taken.

	* powerpc.cc (Target_powerpc::local_reloc_may_be_function_pointer):
	Only ignore relocs on ELFv1.
	(Target_powerpc::global_reloc_may_be_function_pointer): Likewise.
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