Disable some questionable/broken/dangerous features.

We also don't require -lipc anymore.

--- configure.orig	Tue Oct 21 04:32:25 2003
+++ configure	Mon Apr 17 14:24:03 2017
@@ -463,26 +463,10 @@ case "$FEATURE_XFT" in
 	;;
 esac
 
-# if network protocols are unspecified, and the network header files are
-# present, then assume they should be used.
-if [ "$PROTOCOL_HTTP" = "" -a "$inet" ]
-then
-	why "Assuming HTTP should be supported because Internet headers were found"
-	PROTOCOL_HTTP=define
-elif [ "$PROTOCOL_HTTP" = "" ]
-then
-	why "Assuming HTTP should not be supported because Internet headers were not found"
-	PROTOCOL_HTTP=undef
-fi
-if [ "$PROTOCOL_FTP" = "" -a "$inet" ]
-then
-	why "Assuming FTP should be supported because Internet headers were found"
-	PROTOCOL_FTP=define
-elif [ "$PROTOCOL_FTP" = "" ]
-then
-	why "Assuming FTP should not be supported because Internet headers were not found"
-	PROTOCOL_FTP=undef
-fi
+why "Assuming HTTP should not be supported because it's dangerous"
+PROTOCOL_HTTP=undef
+why "Assuming FTP should not be supported because it's dangerous" 
+PROTOCOL_FTP=undef
 
 ################################################################################
 
@@ -794,8 +778,6 @@ case "$SYS" in
 	why "For OpenBSD, we ignore the <sys/select.h> file"
 	NEED_SELECT_H="undef"
 	TLIBS="-lcurses"
-	who "   To support X11, it also requires -lipc"
-	XLIBS=" -lipc"
 	;;
 
   *netbsd*)
@@ -979,15 +961,15 @@ cat >config.h <<eof-config
  */
 #define	DISPLAY_HEX	/* hex		interactive hex dump */
 #define	DISPLAY_HTML	/* html		formatted text */
-#define	DISPLAY_MAN	/* man		formatted text */
-#define	DISPLAY_TEX	/* tex		formatted text */
+#undef	DISPLAY_MAN	/* man		formatted text */
+#undef	DISPLAY_TEX	/* tex		formatted text */
 #define	DISPLAY_SYNTAX	/* syntax	generic syntax coloring */
 #${PROTOCOL_HTTP}	PROTOCOL_HTTP	/* define to enable HTTP; undef to disable */
 #${PROTOCOL_FTP}	PROTOCOL_FTP	/* define to enable FTP; undef to disable */
 #define	FEATURE_ALIAS	/* the :alias command */
 #define	FEATURE_ARRAY	/* arrays in :calc expressions */
 #define	FEATURE_AUTOCMD	/* the :autocmd command */
-#define	FEATURE_BACKTICK /* the \`program\` notation in file names */
+#undef	FEATURE_BACKTICK /* the \`program\` notation in file names */
 #define	FEATURE_BROWSE	/* the :browse and :sbrowse commands */
 #define	FEATURE_CACHEDESC /* store syntax/markup descriptions in RAM */
 #define	FEATURE_CALC	/* built-in calculator -- see command below */