binutils/testsuite/

binutils/testsuite/
	* lib/binutils-common.exp: New file.
	* lib/utils-lib.exp (load_common_lib): New function.  Load
	binutils-common.exp.
	(is_elf_format): Delete.

gas/testsuite/
	* lib/gas-defs.exp (load_common_lib): New function.  Load
	binutils-common.exp.
	(is_elf_format, is_aout_format, is_pecoff_format): Delete.

ld/testsuite/
	* lib/ld-lib.exp (load_common_lib): New function.  Load
	binutils-common.exp.
	(is_elf_format, is_elf64, is_aout_format, is_pecoff_format): Delete.