Fix treatment of EOF from player

Commit 79407e68 (v4.3.11) changed recvclient() to keep failing after
receiving EOF from player.  This was bad, because some places getting
input check player->aborted instead of recvclient() failure, and
player->aborted wasn't set on EOF.  Bugs caused by this:

* comm_bomb(), ship_bomb(), plane_bomb(), land_bomb() went into an
  infinite loop that eventually ate all memory.

* deli(), desi(), dist(), fly(), morale(), zdon(), att_prompt(),
  ask_move_in() interpreted EOF as empty input instead of no more
  input.

* cmd_sail_ship() dereferenced a null pointer.

Fix by setting player->aborted on EOF, too.

include/player.h

@@ -76,7 +76,7 @@ struct player {
     int simulation;		/* e.g. budget command */
     double dolcost;
     time_t curup;		/* when last input was received */
-    int aborted;		/* interrupt cookie received? */
+    int aborted;		/* interrupt cookie or EOF received? */
     int eof;			/* EOF (cookie or real) received? */
     int recvfail;		/* #recvclient() failures */
     int curid;			/* for pr, cur. line's id, -1 none */

src/lib/player/player.c

@@ -111,7 +111,7 @@ player_main(struct player *p)
 
     while (status()) {
 	command();
-	player->aborted = 0;
+	player->aborted = player->eof;
 	empth_yield();
     }
     /* #*# I put the following line in to prevent server crash -KHS */

src/lib/player/recvclient.c

@@ -48,7 +48,8 @@
  * This may block for input, yielding the processor.  Flush buffered
  * output when blocking, to make sure player sees the prompt.
  * If the player's connection has the I/O error or EOF indicator set,
- * or the line is "ctld", set the player's eof flag and return -1.
+ * or the line is "ctld", set the player's eof and aborted flag and
+ * return -1.
  * If the line is "aborted", set the player's aborted flag and return
  * -2.
  * Else return the length of the line.
@@ -60,13 +61,13 @@ recvclient(char *cmd, int size)
     int count;
 
     count = -1;
-    while (!player->aborted && !player->eof) {
+    while (!player->aborted) {
 	/* Try to get a line of input */
 	count = io_gets(player->iop, cmd, size);
 	if (count >= 0) {
 	    /* got it */
 	    if (strcmp(cmd, "ctld") == 0)
-		player->eof = 1;
+		player->aborted = player->eof = 1;
 	    if (strcmp(cmd, "aborted") == 0)
 		player->aborted = 1;
 	    journal_input(cmd);
@@ -86,10 +87,10 @@ recvclient(char *cmd, int size)
 	/* Await more input */
 	io_input(player->iop, IO_WAIT);
 	if (io_error(player->iop) || io_eof(player->iop))
-	    player->eof = 1;
+	    player->aborted = player->eof = 1;
     }
 
-    if (player->aborted || player->eof) {
+    if (player->aborted) {
 	player->recvfail++;
 	if (player->recvfail > 255) {
 	    /*