patch 8.2.2937: popup test fails if rightleft feature not enabled

Problem:    Popup test fails if rightleft feature not enabled.
Solution:   Check that the rightleft feature is available. (Dominique Pellé,
            closes #8321)
diff --git a/src/version.c b/src/version.c
index a230c4e..d59df5c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2937,
+/**/
     2936,
 /**/
     2935,