(1) Fix subversion-static port to use SERF.
(2) Backport fix of issue #4383: problems with symbolic-link WC.
(3) Backport change r1500762 (no isue # found): conflict between
GPG Agent and other password stories.
(4) Fix error message when Subversion is configured with BDB abd
APR is not.
PR: ports/179807, ports/180121, ports/180121
Submitted by:  firstname.lastname@example.org