Log Message:
Apply the "convention over configuration" principle:

If ${FILESDIR}/getsite.sh exists, then use it to determine the fetch
URL for each of the distfiles for the package.  Otherwise, use
SITE_<file> and MASTER_SITES, in order, to determine the URL for each
distfile.

If the script path differs from ${FILESDIR}/getsite.sh, then set
DYNAMIC_SITE_SCRIPT to the full path to that script.

Remove the need to set DYNAMIC_MASTER_SITES explicitly in the package
Makefile for:

	graphics/ns-cult3d
	wm/sawfish-themes
	www/apache-tomcat55
	www/jakarta-tomcat4
	www/jakarta-tomcat5