silence ln warnings on libgdmaps test re-execution
Fix test output stuff under automake 1.13+

Basically, switched from using the automake testrunner back to
  using a check-local rule.  This is due to compatibility issues
  between the new parallel-tests default in automake 1.13 and
  Debian's automake 1.11.6 not having the newer "serial-tests"
  option.

http://lists.gnu.org/archive/html/automake/2013-01/msg00051.html