patch 8.1.1544: some balloon tests don't run when they can
Problem: Some balloon tests don't run when they can.
Solution: Split GUI balloon tests off into a separate file. (Ozaki Kiichi,
closes #4538) Change the feature check into a command for
consistency.
diff --git a/src/version.c b/src/version.c
index 0b036d0..e4ef380 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
+ 1544,
+/**/
1543,
/**/
1542,