libbb: factor out code which queries screen width

function                                             old     new   delta
get_terminal_width                                     -      17     +17
stty_main                                           1196    1197      +1
pstree_main                                          321     319      -2
ls_main                                              735     731      -4
watch_main                                           232     225      -7
bb_progress_update                                   714     706      -8
ps_main                                              555     543     -12
run_applet_and_exit                                  708     695     -13
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/6 up/down: 18/-46)            Total: -28 byte

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/procps/watch.c b/procps/watch.c
index 0397f21..97aa047 100644
--- a/procps/watch.c
+++ b/procps/watch.c
@@ -72,7 +72,7 @@
 
 			// STDERR_FILENO is procps3 compat:
 			// "watch ls 2>/dev/null" does not detect tty size
-			get_terminal_width_height(STDERR_FILENO, &new_width, NULL);
+			new_width = get_terminal_width(STDERR_FILENO);
 			if (new_width != width) {
 				width = new_width;
 				free(header);