patch 8.1.0575: Termdebug: clearing multi-breakpoint does not work

Problem:    Termdebug: clearing multi-breakpoint does not work.
Solution:   Delete all X.Y breakpoints.  Keep more information about placed
            breakpoints. (Ozaki Kiichi, closes #3641)
diff --git a/src/version.c b/src/version.c
index 45d1858..981d918 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    575,
+/**/
     574,
 /**/
     573,