Fix treatment of EOF from player

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.