patch 8.1.1708: Coverity warns for using uninitialized variable

Problem:    Coverity warns for using uninitialized variable.
Solution:   Set the start col when col is set.
diff --git a/src/version.c b/src/version.c
index b1187db..d1f5eba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1708,
+/**/
     1707,
 /**/
     1706,