Log Message:
Revert commit:

Module Name:	pkgsrc
Committed By:	sbd
Date:		Wed Dec  7 20:39:19 UTC 2011

Modified Files:
	pkgsrc/mail/cyrus-imapd: Makefile
	pkgsrc/mail/cyrus-imapd23: Makefile
	pkgsrc/mail/cyrus-imapd24: Makefile

Log Message:
If a package Makefile is going to try and detect a builtin libraray it
should honor the PREFER* variables.