patch 8.0.1319: can't build GUI on MS-Windows

Problem:    Can't build GUI on MS-Windows.
Solution:   Don't define the balloon_split() function in a GUI-only build.

runtime/doc/eval.txt

@@ -2708,13 +2708,16 @@ balloon_show({expr})					*balloon_show()*
 
 		When showing a balloon is not possible nothing happens, no
 		error message.
-		{only available when compiled with the +balloon_eval feature}
+		{only available when compiled with the +balloon_eval or
+		+balloon_eval_term feature}
 
 balloon_split({msg})					*balloon_split()*
 		Split {msg} into lines to be displayed in a balloon.  The
 		splits are made for the current window size and optimize to
 		show debugger output.
 		Returns a |List| with the split lines.
+		{only available when compiled with the +balloon_eval_term
+		feature}
 
 							*browse()*
 browse({save}, {title}, {initdir}, {default})

src/evalfunc.c

@@ -61,7 +61,9 @@ static void f_atan2(typval_T *argvars, typval_T *rettv);
 #endif
 #ifdef FEAT_BEVAL
 static void f_balloon_show(typval_T *argvars, typval_T *rettv);
+# if defined(FEAT_BEVAL_TERM)
 static void f_balloon_split(typval_T *argvars, typval_T *rettv);
+# endif
 #endif
 static void f_browse(typval_T *argvars, typval_T *rettv);
 static void f_browsedir(typval_T *argvars, typval_T *rettv);
@@ -495,7 +497,9 @@ static struct fst
 #endif
 #ifdef FEAT_BEVAL
     {"balloon_show",	1, 1, f_balloon_show},
+# if defined(FEAT_BEVAL_TERM)
     {"balloon_split",	1, 1, f_balloon_split},
+# endif
 #endif
     {"browse",		4, 4, f_browse},
     {"browsedir",	2, 2, f_browsedir},
@@ -1424,6 +1428,7 @@ f_balloon_show(typval_T *argvars, typval_T *rettv UNUSED)
     }
 }
 
+# if defined(FEAT_BEVAL_TERM)
     static void
 f_balloon_split(typval_T *argvars, typval_T *rettv UNUSED)
 {
@@ -1444,6 +1449,7 @@ f_balloon_split(typval_T *argvars, typval_T *rettv UNUSED)
 	}
     }
 }
+# endif
 #endif
 
 /*

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1319,
 /**/
     1318,
 /**/