Skip GLib tests when GLib is older than 2.38

GLib 2.38 was the first stable release with TAP output support, and
our unit test relies on that.
Signed-off-by: Simon McVittie <smcv@collabora.com>

configure.ac

@@ -78,7 +78,7 @@ AC_ARG_WITH([glib],
   [],
   [with_glib=auto])
 AS_IF([test "$with_glib" != no],
-  [PKG_CHECK_MODULES([GLIB], [glib-2.0], [have_glib=yes], [have_glib=no])],
+  [PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.38], [have_glib=yes], [have_glib=no])],
   [have_glib=no])
 AS_IF([test "$with_glib" = yes && test "$have_glib" = no],
   [AC_MSG_ERROR([GLib required but not found])])

debian/rules

@@ -23,7 +23,7 @@ confflags += --disable-gtk-doc
 endif
 
 ifeq ($(DEB_HOST_ARCH),amd64)
-confflags += --with-glib
+confflags += --with-glib=auto
 else
 confflags += --without-glib
 endif

tests/utils.c

@@ -145,9 +145,7 @@ main (int argc,
       char **argv)
 {
   g_test_init (&argc, &argv, NULL);
-#if GLIB_CHECK_VERSION(2, 38, 0)
   g_test_set_nonfatal_assertions ();
-#endif
 
   g_test_add ("/build-filename", Fixture, NULL, setup,
               test_build_filename, teardown);