patch 8.0.0604: gF test fails still on MS-Windows

Problem:    gF test fails still on MS-Windows.
Solution:   Use : before the line number and remove it from 'isfname'.
diff --git a/src/version.c b/src/version.c
index 6a65035..bc80ace 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    604,
+/**/
     603,
 /**/
     602,