patch 9.0.1300: 'statusline' only supports one "%=" item

Problem:    'statusline' only supports one "%=" item.
Solution:   Add support for multiple "%=" items. (TJ DeVries, Yegappan
            Lakshmanan, closes #11970, closes #11965)
diff --git a/src/version.c b/src/version.c
index 9e8e975..f28cfd8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1300,
+/**/
     1299,
 /**/
     1298,