patch 8.1.1276: cannot combine text properties with syntax highlighting

Problem:    Cannot combine text properties with syntax highlighting.
Solution:   Add the "combine" field to prop_type_add(). (closes #4343)

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1276,
 /**/
     1275,
 /**/