Improve .rsrc section merging again. This time with an algorithm that

Improve .rsrc section merging again.  This time with an algorithm that
should work for all types of input .rsrc section.

	* peXXigen.c (rsrc_process_section): Add code to scan input
	sections and record their lengths.  Use these lengths to find the
	start of each merged .rsrc section.

	* scripttempl/pe.sc (R_RSRC): Fix default-manifest exclusion.
	(.rsrc): Add SUBALIGN(4).  Remove SORT.
	* scripttempl/pep.sc: Likewise.