patch 8.1.1149: building desktop files fails with older msgfmt

Problem:    Building desktop files fails with older msgfmt.
Solution:   Add autoconf check.  Avoid always building the desktop files.
diff --git a/src/version.c b/src/version.c
index 3da2d7a..433f6bf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1149,
+/**/
     1148,
 /**/
     1147,