* layout.cc (Layout::set_segment_offsets): Don't try to realign data

	* layout.cc (Layout::set_segment_offsets): Don't try to realign data
	segment that has been aligned for relro.
	* output.cc (Output_segment::set_section_addresses): Change signature;
	adjust all callers.  Account for alignment when totalling
	size of relro sections.
	* output.h (Output_segment::set_section_addresses): Change signature.
	* testsuite/Makefile.am (relro_test.sh, relro_test.stdout): New
	targets.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/relro_test.cc: Add alignment attributes to test proper
	alignment of relro sections when padding is necessary.
	* testsuite/relro_test.sh: New script.