Minor fix for R_PPC_VLE_ADDR20

It is incorrect to "continue" in the ppc_elf_relocate_section reloc
processing loop except when editing or deleting relocs.  The normal
loop processing arranges to write the relocs if shuffling them over a
deleted entry.  Deleting only happens for debug sections currently and
those sections won't contain R_PPC_VLE_ADDR20 relocs, so this patch
doesn't fix a bug that would trigger with any normal object file.

	* elf32-ppc.c (ppc_elf_relocate_section): After applying
	R_PPC_VLE_ADDR20, goto copy_reloc.