patch 8.0.1314: build fails on Mac

Problem:    Build fails on Mac. (chdiza)
Solution:   Add #ifdef around GUI fields.

src/beval.h

@@ -32,6 +32,7 @@ typedef enum
 
 typedef struct BalloonEvalStruct
 {
+#ifdef FEAT_BEVAL_GUI
 # ifdef FEAT_GUI_GTK
     GtkWidget		*target;	/* widget we are monitoring */
     GtkWidget		*balloonShell;
@@ -62,14 +63,16 @@ typedef struct BalloonEvalStruct
     BeState		showState;	/* tells us whats currently going on */
 #  endif
 # endif
-    int			ts;		/* tabstop setting for this buffer */
-    char_u		*msg;
-    void		(*msgCB)(struct BalloonEvalStruct *, int);
-    void		*clientData;	/* For callback */
 # if !defined(FEAT_GUI_GTK) && !defined(FEAT_GUI_W32)
     Dimension		screen_width;	/* screen width in pixels */
     Dimension		screen_height;	/* screen height in pixels */
 # endif
+    void		(*msgCB)(struct BalloonEvalStruct *, int);
+    void		*clientData;	/* For callback */
+#endif
+
+    int			ts;		/* tabstop setting for this buffer */
+    char_u		*msg;
 } BalloonEval;
 
 #define EVAL_OFFSET_X 15 /* displacement of beval topleft corner from pointer */

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1314,
 /**/
     1313,
 /**/