build: Add the dselect/methods directory to the TAP::Harness library paths

This is not currently used, but it makes sure these modules are visible
for future tests.

check.am

@@ -12,7 +12,7 @@ TEST_VERBOSE ?= 0
 
 TEST_RUNNER = '\
 	my $$harness = TAP::Harness->new({ \
-	    lib => [ "$(top_srcdir)/scripts" ], \
+	    lib => [ "$(top_srcdir)/scripts", "$(top_srcdir)/dselect/methods"  ], \
 	    color => 1, \
 	    verbosity => $(TEST_VERBOSE), \
 	    failures => 1, \