Revert "Drop support for glib < 2.36"

This reverts commit 495f56659d.

tests/document-input-stream.c

@@ -140,6 +140,9 @@ test_consecutive_multibyte_big_read ()
 int main (int   argc,
           char *argv[])
 {
+#if !GLIB_CHECK_VERSION (2, 36, 0)
+	g_type_init ();
+#endif
 	g_test_init (&argc, &argv, NULL);
 
 	g_test_add_func ("/document-input-stream/empty", test_empty);

tests/document-loader.c

@@ -238,6 +238,9 @@ test_begin_new_line_detection ()
 int main (int   argc,
           char *argv[])
 {
+#if !GLIB_CHECK_VERSION (2, 36, 0)
+	g_type_init ();
+#endif
 	g_test_init (&argc, &argv, NULL);
 
 	pluma_prefs_manager_app_init ();

tests/document-output-stream.c

@@ -119,6 +119,9 @@ test_big_char ()
 int main (int   argc,
           char *argv[])
 {
+#if !GLIB_CHECK_VERSION (2, 36, 0)
+	g_type_init ();
+#endif
 	g_test_init (&argc, &argv, NULL);
 
 	pluma_prefs_manager_app_init ();

tests/document-saver.c

@@ -687,6 +687,9 @@ int main (int   argc,
 	gboolean have_unowned;
 	gboolean have_unowned_group;
 
+#if !GLIB_CHECK_VERSION (2, 36, 0)
+	g_type_init ();
+#endif
 	g_test_init (&argc, &argv, NULL);
 
 	pluma_prefs_manager_app_init ();

tests/smart-converter.c

@@ -341,6 +341,9 @@ test_guessed ()
 int main (int   argc,
           char *argv[])
 {
+#if !GLIB_CHECK_VERSION (2, 36, 0)
+	g_type_init ();
+#endif
 	g_test_init (&argc, &argv, NULL);
 
 	g_test_add_func ("/smart-converter/utf8-utf8", test_utf8_utf8);