Revert "Do not try to use gpm in X11."

This reverts commit 8183aecd90.

src/network/socket.c

@@ -81,7 +81,7 @@ struct socket_weak_ref {
 static INIT_LIST_OF(struct socket_weak_ref, socket_weak_refs);
 
 /* To enable logging of tranfers, for debugging purposes. */
-#if 1
+#if 0
 
 #define DEBUG_TRANSFER_LOGFILE "/tmp/log"
 

src/osdep/unix/unix.c

@@ -10,8 +10,6 @@
 #include <gpm.h>
 #endif
 
-#include <stdlib.h>
-
 #include "elinks.h"
 
 #include "main/select.h"
@@ -82,9 +80,6 @@ static int
 init_mouse(int cons, int suspend)
 {
 	Gpm_Connect conn;
-	unsigned char *display = getenv("DISPLAY");
-
-	if (display && *display) return -1;
 
 	/* We want to get even move events because of the wheels. */
 	conn.eventMask = suspend ? 0 : ~0;