patch 8.1.1145: compiler warning for unused function

Problem:    Compiler warning for unused function. (Tony Mechelynck)
Solution:   Add #ifdef.

src/option.c

@@ -6030,6 +6030,7 @@ valid_filetype(char_u *val)
     return valid_name(val, ".-_");
 }
 
+#if defined(FEAT_SPELL) || defined(PROTO)
 /*
  * Return TRUE if "val" is a valid 'spellang' value.
  */
@@ -6052,6 +6053,7 @@ valid_spellfile(char_u *val)
 	    return FALSE;
     return TRUE;
 }
+#endif
 
 /*
  * Handle string options that need some action to perform when changed.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1145,
 /**/
     1144,
 /**/