This patch gets rid of catch_exceptions / catch_exceptions_with_msg.
The latter is done mostly by getting rid of the three remaining
vestigial libgdb wrapper functions, which are really pointless
nowadays.  This results in a good number of simplifications.

(I checked that Insight doesn't use those functions.)

The gdb.mi/mi-pthreads.exp change is necessary because this actually
fixes a bug, IMO -- the patch stops MI's -thread-select causing output
on the CLI stream.

I.e., before:
 -thread-select 123456789
 &"Thread ID 123456789 not known.\n"
 ^error,msg="Thread ID 123456789 not known."
 (gdb)

After:
 -thread-select 123456789
 ^error,msg="Thread ID 123456789 not known."
 (gdb)

gdb/ChangeLog
2017-10-10  Pedro Alves <palves@redhat.com>
	    Tom Tromey  <tom@tromey.com>

	* breakpoint.c (struct captured_breakpoint_query_args)
	(do_captured_breakpoint_query, gdb_breakpoint_query): Delete.
	(print_breakpoint): New.
	* breakpoint.h (print_breakpoint): Declare.
	* common/common-exceptions.h (enum return_reason): Remove
	references to catch_exceptions.
	* exceptions.c (catch_exceptions, catch_exceptions_with_msg):
	Delete.
	* exceptions.h (catch_exceptions_ftype, catch_exceptions)
	(catch_exception_ftype, catch_exceptions_with_msg): Delete.
	* gdb.h: Delete.
	* gdbthread.h (thread_select): Declare.
	* mi/mi-cmd-break.c: Don't include gdb.h.
	(breakpoint_notify): Use print_breakpoint.
	* mi/mi-cmd-catch.c: Don't include gdb.h.
	* mi/mi-interp.c: Don't include gdb.h.
	(mi_print_breakpoint_for_event): New.
	(mi_breakpoint_created, mi_breakpoint_modified): Use
	mi_print_breakpoint_for_event.
	* mi/mi-main.c: Don't include gdb.h.
	(mi_cmd_thread_select): Parse the global thread ID here.  Use
	thread_select instead of gdb_thread_select.
	(mi_cmd_thread_list_ids): Output "thread-ids" tuple here instead
	of using gdb_list_thread_ids.
	* remote-fileio.c (do_remote_fileio_request): Change type.  Reply
	FILEIO_ENOSYS here.
	(remote_fileio_request): Use TRY/CATCH instead of
	catch_exceptions.
	* symfile-mem.c (struct symbol_file_add_from_memory_args)
	(symbol_file_add_from_memory_wrapper): Delete.
	(add_vsyscall_page): Use TRY/CATCH instead of catch_exceptions.
	* thread.c: Don't include gdb.h.
	(do_captured_list_thread_ids, gdb_list_thread_ids): Delete.
	(thread_alive): Use thread_select.
	(do_captured_thread_select): Delete, parts salvaged as ...
	(thread_select): ... this new function.
	(gdb_thread_select): Delete.

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

	* gdb.mi/mi-pthreads.exp (check_mi_thread_command_set): Don't
	expect CLI output.