Log Message:
Remove devel/xulrunner192 and devel/swt.

xulrunner192 was the last remains of Firefox 3.6 in pkgsrc.

The last package depending on xulrunner192 was devel/swt. swt isn't used by
anything in pkgsrc (old versions of eclipse which weren't imported, maybe),
and was originally added by jmcneill, who says it can be removed now.