Revert ALIGN changes

Revert ALIGN changes

Reverts a2c59f28 and e474ab13.  Since the unary form of ALIGN only
references "dot" implicitly, there isn't really a strong argument for
making ALIGN use a relative value when inside an output section.

	* ldexp.c (align_dot_val): Delete.
	(fold_unary <ALIGN_K, NEXT>): Revert 2015-07-10 change.
	(is_align_conditional): Revert 2015-07-20 change.
	(exp_fold_tree_1): Likewise, but keep expanded comment.
	* scripttempl/elf.sc (.ldata, .bss): Revert 2015-07-20 change.
	* ld.texinfo (<ALIGN>): Correct description.