Make import libraries relocatable objects

For ELF targets --out-implib currently generates an executable file
(e_type is ET_EXEC) despite the file being expected to be linked against
some other object file to make an executable later. It seems therefore
more sensible to make the import library a relocatable object file
(e_type set to ET_REL).

Incidentally, as dicted by requirement 8 of
"ARM v8-M Security Extensions: Requirements on Development Tools"
(document ARM-ECM-0359818) version 1.0, import libraries generated when
using --cmse-implib *must* be relocatable object file so this commit
also adds an assert there in case the type of ELF import library is
changed again in the future.

2017-05-08  Thomas Preud'homme  <thomas.preudhomme@arm.com>

bfd/
	* elflink.c (elf_output_implib): Remove executable flag from import
	library bfd.
	* elf32-arm.c (elf32_arm_filter_implib_symbols): Assert that the import
	library is a relocatable object file.

ld/
	* testsuite/ld-arm/arm-elf.exp
	(Secure gateway import library generation): Check e_type field
	of import library and executable produced.
	* testsuite/ld-arm/cmse-implib.type: Expectations for e_type field.

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