sysutils/screen: Fix SHOWENC build

The SHOWENC optional patch is now included in screen 4.9.0. We simply
enable the option now and build. The patch is redundant.

PR:		262641
Reported by:	Trond.Endrestol@ximalas.info, sunpoet, many others
Fixes:		9bdc788616

sysutils/screen/Makefile

@@ -75,7 +75,7 @@ CFLAGS+=	-DNONETHACK
 
 # show encoding on the status line via option "showenc"
 .if ${PORT_OPTIONS:MSHOWENC}
-EXTRA_PATCHES+=	${FILESDIR}/opt-showencoding
+CFLAGS+=	-DENCODINGS
 .endif
 
 post-patch:

sysutils/screen/files/opt-showencoding

@@ -1,21 +0,0 @@
---- screen.c.orig	2017-01-17 11:28:29.397404660 -0800
-+++ screen.c	2017-01-18 12:24:40.855402000 -0800
-@@ -2760,6 +2760,18 @@
-       }
-       p += strlen(p) - 1;
-       break;
-+#ifdef ENCODINGS
-+	case 'e':
-+	  *p = 0;
-+	  D_encoding = nwin_options.encoding > 0 ? nwin_options.encoding : 0;
-+	  if (win && win->w_encoding)
-+	    {
-+	      *p++ = ' ';
-+	      strcpy(p, EncodingName(win->w_encoding));
-+	    }
-+	  p += strlen(p) - 1;
-+	  break;
-+#endif
- 
-     case '{':
-     {