patch 8.1.1494: build failure

Problem:    Build failure.
Solution:   Add missing changes.

src/structs.h

@@ -1991,6 +1991,9 @@ typedef enum {
     POPPOS_TOPRIGHT,
     POPPOS_CENTER
 } poppos_T;
+
+# define POPUPWIN_DEFAULT_ZINDEX    50
+# define POPUPMENU_ZINDEX	    100
 #endif
 
 /*

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1494,
 /**/
     1493,
 /**/