Don't warn function alignment if warn_if_not_aligned_p is true

Don't warn function alignment if warn_if_not_aligned_p is true

When warn_if_not_aligned_p is true, a warning will be issued on function
declaration later.  There is no need to warn function alignment when
warn_if_not_aligned_p is true.

	* c-attribs.c (common_handle_aligned_attribute): Don't warn
	function alignment if warn_if_not_aligned_p is true.

From-SVN: r252036