Pullup ticket #3285 - requested by taca

Pullup ticket #3285 - requested by taca
lang/ruby18-base: build fix
lang/ruby19-base: build fix

Revisions pulled up:
- lang/ruby/rubyversion.mk			1.53
- lang/ruby18-base/PLIST			1.18
- lang/ruby19-base/PLIST			1.3
---
Module Name:	pkgsrc
Committed By:	taca
Date:		Wed Nov 17 14:27:10 UTC 2010

Modified Files:
	pkgsrc/lang/ruby: rubyversion.mk
	pkgsrc/lang/ruby18-base: PLIST
	pkgsrc/lang/ruby19-base: PLIST

Log Message:
Some improvements for rubyversion.mk:

- Set RUBY_API_VERSION after RUBY_VERSION has decided.
- Change old RUBY_DOCDIR and RUBY_EXAMPLESDIR to RUBY_DOC and RUBY_EG in
  comment.
- Fix shared libraries PLIST to support Mac OS X with introducing RUBY_SLEXT:
	Shared library => .dylib
	Extension library => .bundle
- Improve PRINT_PLIST_AWK to handle new shared libraries.

No functional change shoud be done and fix PR pkg/44050.