Don't align start of segment unless alignment is larger than page size.

Don't align start of segment unless alignment is larger than page size.

This fixes an issue where a page-aligned data section, combined with -z relro,
could lead to a gap between text and data segments larger than a page, and
we would fail to overlap the segments in the file.

gold/
	* layout.cc (Layout::set_segment_offsets): Don't align start of segment
	unless alignment is larger than page size.