enable invocation of "make test" for out-of-place builds

[jeffhammond]

The path to runfabtests.sh for make test was hard-coded, which meant that it failed for an out-of-place build.

This trivial patch fixes it. It's almost certainly easier to retype this patch than to actually merge it, and presumably that makes the administrative issues simpler.

> cat 0001-enable-out-of-place-make-test.patch 
From 16d56f1a1f757025f67d8c85ae60b91d96e6558d Mon Sep 17 00:00:00 2001
From: Jeff Hammond <jeff.science@gmail.com>
Date: Wed, 18 Nov 2015 11:36:04 -0800
Subject: [PATCH] enable out-of-place make-test

---
 Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 194e0e2..7aa1857 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -275,4 +275,4 @@ EXTRA_DIST += \
 endif

 test:
-   ./scripts/runfabtests.sh -vvv
+   $(srcdir)/scripts/runfabtests.sh -vvv
-- 
1.7.12.4