patch 8.1.0561: MSCV error format has changed

Problem:    MSCV error format has changed.
Solution:   Make the space between the line number and colon optional.
diff --git a/src/version.c b/src/version.c
index 355b114..cbe4636 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    561,
+/**/
     560,
 /**/
     559,