Fix inferior deadlock with "target remote | CMD"

Fix inferior deadlock with "target remote | CMD"

Comparing test results between

  --target_board=native-gdbserver
  --target_board=native-stdio-gdbserver

I noticed that gdb.base/bigcore.exp is failing with native-stdio-gdbserver:

  Running src/gdb/testsuite/gdb.base/bigcore.exp ...
  FAIL: gdb.base/bigcore.exp: continue (timeout)
  ...

The problem is that:

  1. When debugging with "target remote | CMD", the inferior's
     stdout/stderr streams are connected to a pipe.

  2. The bigcore.c program prints a lot to the screen before it
     reaches the breakpoint location that the "continue" shown above
     wants to reach.

  3. GDB is not flushing the inferior's output pipe while the inferior
     is running.

  4. The pipe becomes full.

  5. The inferior thus deadlocks.

The bug is #3 above, which is what this commit fixes.  A new test is
added, that specifically exercises this scenario.  The test fails
before the fix, and passes after, and gdb.base/bigcore.exp also starts
passing.

gdb/ChangeLog:
2017-10-19  Pedro Alves  <palves@redhat.com>

	* ser-base.c (ser_base_read_error_fd): Delete the file handler if
	async.
	(handle_error_fd): New function.
	(ser_base_async): Add/delete an event loop file handler for
	error_fd.

gdb/testsuite/ChangeLog:
2017-10-19  Pedro Alves  <palves@redhat.com>

	* gdb.base/long-inferior-output.c: New file.
	* gdb.base/long-inferior-output.exp: New file.