build: enable -Werror for gnulib-tests, too

* gnulib: Update to latest for warning-free tests.
* gnulib-tests/Makefile.am (AM_CFLAGS): Uncomment $(WERROR_CFLAGS),
now that these tests are warning-free.

diff --git a/gnulib b/gnulib
index 78c0415..b392a22 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 78c0415acc2ea96febfc9d68c04d765e9d2dd20d
+Subproject commit b392a22453f992de59b63b157c191d3118fb9ed7

diff --git a/gnulib-tests/Makefile.am b/gnulib-tests/Makefile.am
index 7ec0a1c..9883a77 100644 (file)
--- a/gnulib-tests/Makefile.am
+++ b/gnulib-tests/Makefile.am
@@ -1,6 +1,6 @@
 include gnulib.mk
 
-AM_CFLAGS = $(GNULIB_TEST_WARN_CFLAGS) # $(WERROR_CFLAGS)
+AM_CFLAGS = $(GNULIB_TEST_WARN_CFLAGS) $(WERROR_CFLAGS)
 
 # A few tests are inherently warning-evoking.
 # Since we require -Werror, exempt the few offenders.