Do not choose a non-ELF format input file to hold the linker created GOT sections.

Do not choose a non-ELF format input file to hold the linker created GOT sections.

bfd/

	PR 21884
	* elf32-i386.c (elf_i386_link_setup_gnu_properties): If the dynobj
	has not been set then use the bfd returned by
	_bfd_elf_link_setup_gnu_properties.  If that is null then search
	through all the input bfds selecting the first normal, ELF format
	one.
	* elf64-x86-64.c (elf_x86_64_link_setup_gnu_properties): Likewise.

ld/

	PR ld/21884
	* testsuite/ld-i386/i386.exp: Run pr21884.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/ld-i386/pr21884.d: New file.
	* testsuite/ld-i386/pr21884.t: Likewise.
	* testsuite/ld-x86-64/pr21884.d: Likewise.
	* testsuite/ld-x86-64/pr21884.t: Likewise.

(cherry picked from commit b7a18930e3925c4092bd975e95bc3603aa1418d9 and
 9593aade74f0da0c08a4ab55e4c59173b07b1f63)