patch 9.0.0278: the +wildignore feature is nearly always available

Problem:    The +wildignore feature is nearly always available.
Solution:   Graduate +wildignore for consistency.
diff --git a/src/version.c b/src/version.c
index 1fd798b..9088962 100644
--- a/src/version.c
+++ b/src/version.c
@@ -655,11 +655,7 @@
 	"-vtp",
 # endif
 #endif
-#ifdef FEAT_WILDIGN
 	"+wildignore",
-#else
-	"-wildignore",
-#endif
 #ifdef FEAT_WILDMENU
 	"+wildmenu",
 #else
@@ -724,6 +720,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    278,
+/**/
     277,
 /**/
     276,