patch 8.1.1255: building desktop files fails on FreeBSD

Problem:    Building desktop files fails on FreeBSD. (Adam Weinberger)
Solution:   Avoid using non-portable construct in Makefile. (closes #4332)
diff --git a/src/version.c b/src/version.c
index 0882fa2..f03346c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1255,
+/**/
     1254,
 /**/
     1253,