wcwidth tests: Fix link error

[Bruno Haible]

On a system with a recent libunistring installed, a testdir of all of gnulib
produces a link error in test-wcwidth (regarding the symbol 'uc_width').
The reason is that the 'libunistring' or 'libunistring-optional' modules
causes 'uc_width' to come from libunistring.

This fixes it.


2018-05-20  Bruno Haible  <address@hidden>

        wcwidth tests: Fix link error.
        * modules/wcwidth-tests (Makefile.am): Link test-wcwidth against
        $(LIBUNISTRING).

diff --git a/modules/wcwidth-tests b/modules/wcwidth-tests
index 34ddc2c..9606674 100644
--- a/modules/wcwidth-tests
+++ b/modules/wcwidth-tests
@@ -12,3 +12,4 @@ configure.ac:
 Makefile.am:
 TESTS += test-wcwidth
 check_PROGRAMS += test-wcwidth
+test_wcwidth_LDADD = $(LDADD) $(LIBUNISTRING)