PowerPC64 stubs don't match calculated size

PowerPC64 stubs don't match calculated size

After the PR 21411 fix, the linker generated .eh_frame for ppc64 glink
can be edited by the generic code.  The sequence of events goes
something like:
1) Some object file adds .eh_frame aligned to 8, making the output
   .eh_frame aligned to at least 8, so linker generated .eh_frame FDE
   is padded to an 8 byte boundary.
2) All .eh_frame past the glink .eh_frame is garbage collected.
3) Generic code detects that last FDE (the glink .eh_frame) doesn't
   need to be padded to an 8 byte boundary, reducing size from 88 to
   84.
4) elf64-ppc.c check fails.

	PR 21441
	* elf64-ppc.c (ppc64_elf_build_stubs): Don't check glink_eh_frame
	size.