Warn for ar/nm/ranlib/ld on lto objects without plugin

	PR 13227
bfd/
	* archive.c (_bfd_compute_and_write_armap): Warn on adding
	__gnu_lto_slim to armap.
	* linker.c (_bfd_generic_link_add_one_symbol): Warn on adding
	__gnu_lto_slim to linker hash table.
binutils/
	* nm.c (filter_symbols): Warn on __gnu_lto_slim.
5 files changed