patch 9.0.1372: test for 'toolbariconsize' may fail

Problem:    Test for 'toolbariconsize' may fail.
Solution:   Only test 'toolbariconsize' when it is supported. (James McCoy,
            closes #12095)
diff --git a/src/version.c b/src/version.c
index 56739e7..bef7cf0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1372,
+/**/
     1371,
 /**/
     1370,