readelf: Report if no GOT section found

Update "readelf --got-contents" to report if no GOT section found.

	* readelf.c (process_got_section_contents): Report if no GOT
	section found.
	* testsuite/binutils-all/readelf-got.d: New file.
	* testsuite/binutils-all/readelf.exp: Run readelf-got.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
3 files changed