Merge branch 'nd/test-helpers' into maint

Build clean-up.

* nd/test-helpers:
  t/test-lib.sh: fix running tests with --valgrind
  Makefile: use VCSSVN_LIB to refer to svn library
  Makefile: drop extra dependencies for test helpers

diff --cc Makefile
Simple merge

diff --cc t/test-lib.sh
Simple merge