patch 8.1.2327: cannot build with Hangul input

Problem:    Cannot build with Hangul input.
Solution:   Remove Hangul input support.
diff --git a/src/feature.h b/src/feature.h
index 4c0758d..428a904 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -528,9 +528,7 @@
 /*
  * +xim			X Input Method.  For entering special languages like
  *			chinese and Japanese.
- * +hangul_input	Internal Hangul input method.  Must be included
- *			through configure: "--enable-hangulin"
- * Both are for Unix and VMS only.
+ *			this is for Unix and VMS only.
  */
 #ifndef FEAT_XIM
 /* #define FEAT_XIM */
@@ -540,18 +538,9 @@
 # define USE_XIM 1		/* needed for GTK include files */
 #endif
 
-#ifdef FEAT_HANGULIN
-# define HANGUL_DEFAULT_KEYBOARD 2	/* 2 or 3 bulsik keyboard */
-# define ESC_CHG_TO_ENG_MODE		/* if defined, when ESC pressed,
-					 * turn to english mode
-					 */
-# if defined(FEAT_XIM) && !defined(LINT)
-	Error: You should select only ONE of XIM and HANGUL INPUT
-# endif
-#endif
-#if defined(FEAT_HANGULIN) || defined(FEAT_XIM)
-/* # define X_LOCALE */			/* for OS with incomplete locale
-					   support, like old linux versions. */
+#if defined(FEAT_XIM)
+// # define X_LOCALE			// for OS with incomplete locale
+					// support, like old linux versions.
 #endif
 
 /*