Fix the testsuite to built out of tree
in OE S != B

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Upstream-Status: Submitted [https://github.com/ericonr/argp-standalone/pull/9]
Index: argp-standalone-1.3/testsuite/Makefile.am
===================================================================
--- argp-standalone-1.3.orig/testsuite/Makefile.am
+++ argp-standalone-1.3/testsuite/Makefile.am
@@ -5,7 +5,8 @@ TS_ALL = $(TS_PROGS) $(TS_SH)
 
 noinst_PROGRAMS = $(TS_PROGS) ex1 ex3 ex4
 
-LDADD = ../libargp.a
+AM_CPPFLAGS = -I$(top_srcdir)
+LDADD = $(top_builddir)/libargp.a
 
 EXTRA_DIST = $(TS_SH) run-tests
 CLEANFILES = test.out