perf ui browser: Use libslang to read keys

Just another step in stopping the use of libnewt in perf.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uy6s534uqxq8tenh6s3k8ocj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/ui/setup.c

@@ -18,6 +18,18 @@ static void newt_suspend(void *d __used)
 	newtResume();
 }
 
+static int ui__init(void)
+{
+	int err = SLkp_init();
+
+	if (err < 0)
+		goto out;
+
+	SLkp_define_keysym((char *)"^(kB)", SL_KEY_UNTAB);
+out:
+	return err;
+}
+
 static void ui__exit(void)
 {
 	SLtt_set_cursor_visibility(1);
@@ -44,6 +56,7 @@ void setup_browser(bool fallback_to_pager)
 
 	use_browser = 1;
 	newtInit();
+	ui__init();
 	newtSetSuspendCallback(newt_suspend, NULL);
 	ui_helpline__init();
 	ui_browser__init();