patch 8.1.0724: build for MinGW fails

Problem:    Build for MinGW fails.
Solution:   Avoid specifying dependencies in included makefile.
diff --git a/src/version.c b/src/version.c
index aede1e6..50b3263 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    724,
+/**/
     723,
 /**/
     722,