[binutils-gdb] Change backtrace_command_1 calling to use flags

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 1cf7e64086d1490649dc56e1c0505be91c600218 ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 1cf7e64086d1490649dc56e1c0505be91c600218

Change backtrace_command_1 calling to use flags

The next patch will add more flags to backtrace_command_1; and rather
than add another boolean argument, this patch changes it to accept a
flags value.

gdb/ChangeLog
2018-03-26  Tom Tromey  <tom@tromey.com>

	* stack.c (backtrace_command_1): Remove "show_locals" parameter,
	add "flags".
	(backtrace_command): Remove "fulltrace", add "flags".