patch 8.2.0055: cannot use ":gui" in vimrc with VIMDLL enabled

Problem:    Cannot use ":gui" in vimrc with VIMDLL enabled.
Solution:   Change the logic, check "gui.starting". (Ken Takata, closes #5408)
diff --git a/src/version.c b/src/version.c
index a099cd3..98a9ca4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    55,
+/**/
     54,
 /**/
     53,