patch 8.1.1939: code for handling v: variables in generic eval file

Problem:    Code for handling v: variables in generic eval file.
Solution:   Move v: variables to evalvars.c. (Yegappan Lakshmanan,
            closes #4872)
diff --git a/src/version.c b/src/version.c
index 96e0b40..a2e9bee 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1939,
+/**/
     1938,
 /**/
     1937,