patch 8.1.0607: proto files are not in sync with the source code

Problem:    Proto files are not in sync with the source code.
Solution:   Update the proto files.
diff --git a/src/version.c b/src/version.c
index 069feb9..9daf4f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    607,
+/**/
     606,
 /**/
     605,