Revision 340537

Repo-copy mail/postfix -> mail/postfix210, and update
both ports to the latest version.  Also:

- Set INVALID_BDB_VER [1]
- Adopt new LIB_DEPENDS syntax [2]
- Add option to support LMDB databases [2]
- Modify shell command to quiet warnings on 10+ [3]
- Respect upstream Makefile's warning suppression [4]

PR:		[1]: ports/185446
		[2]: ports/185860
		[3]: ports/185857

Submitted by:	[1]: Eero Hanninen <fax@nohik.ee>
		[2]: Yasuhiro KIMURA <yasu@utahime.org>
		[3]: adamw
		[4]: koobs (via email)