perl: Provide library location when running the testsuite

Otherwise the perl testsuite could not locate libloc and will fail.
Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Makefile.am

@@ -201,7 +201,7 @@ build-perl:
 
 .PHONY: check-perl
 check-perl: testdata.db
-	cd $(builddir)/src/perl && $(MAKE) test database="../../$<"
+	cd $(builddir)/src/perl && $(MAKE) LD_LIBRARY_PATH="$(abs_builddir)/src/.libs" test database="../../$<"
 
 .PHONY: install-perl
 install-perl: