Fix link failure in test-suite/standalone

[Eli Zaretskii]

Linking test-scm-take-locale-symbol fails on systems that need
rpl_strdup from gnulib.  Here's the fix:

--- test-suite/standalone/Makefile.am~0 2014-03-20 10:06:33.000000000 +0200
+++ test-suite/standalone/Makefile.am   2014-08-16 14:56:02.828125000 +0300
@@ -179,7 +179,7 @@
 # test-scm-take-locale-symbol
 test_scm_take_locale_symbol_SOURCES = test-scm-take-locale-symbol.c
 test_scm_take_locale_symbol_CFLAGS = ${test_cflags}
-test_scm_take_locale_symbol_LDADD = $(LIBGUILE_LDADD)
+test_scm_take_locale_symbol_LDADD = $(LIBGUILE_LDADD) 
$(top_builddir)/lib/libgnu.la
 check_PROGRAMS += test-scm-take-locale-symbol
 TESTS += test-scm-take-locale-symbol