patch 8.1.0464: MS-Windows: job_info() has cmd without backslashes

Problem:    MS-Windows: job_info() has cmd without backslashes. (Daniel
            Hahler)
Solution:   Use rem_backslash(). (closes #3517, closes #3404)
diff --git a/src/version.c b/src/version.c
index 90588ef..8da8e71 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    464,
+/**/
     463,
 /**/
     462,