libbb: introduce bb_signals and bb_signals_recursive,

which sets same handler for many signals. sig_catch is nuked
(bb_signals_recursive is more descriptive name).
*: use them as appropriate. 

function                                             old     new   delta
bb_signals_recursive                                   -      95     +95
bb_signals                                             -      52     +52
run_command                                          258     273     +15
svlogd_main                                         1368    1377      +9
runsv_main                                          1746    1752      +6
runsvdir_main                                       1643    1646      +3
UNSPEC_print                                          64      66      +2
time_main                                           1128    1127      -1
...
resize_main                                          246     210     -36
sig_catch                                             63       -     -63
set_fatal_sighandler                                  85      14     -71
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 5/24 up/down: 182/-548)        Total: -366 bytes

1 files changed, 0 insertions, 42 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 445e077..8dd414d 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -234,48 +234,6 @@ void xfflush_stdout(void)
 	}
 }
 
-void sig_block(int sig)
-{
-	sigset_t ss;
-	sigemptyset(&ss);
-	sigaddset(&ss, sig);
-	sigprocmask(SIG_BLOCK, &ss, NULL);
-}
-
-void sig_unblock(int sig)
-{
-	sigset_t ss;
-	sigemptyset(&ss);
-	sigaddset(&ss, sig);
-	sigprocmask(SIG_UNBLOCK, &ss, NULL);
-}
-
-#if 0
-void sig_blocknone(void)
-{
-	sigset_t ss;
-	sigemptyset(&ss);
-	sigprocmask(SIG_SETMASK, &ss, NULL);
-}
-#endif
-
-void sig_catch(int sig, void (*f)(int))
-{
-	struct sigaction sa;
-	sa.sa_handler = f;
-	sa.sa_flags = 0;
-	sigemptyset(&sa.sa_mask);
-	sigaction(sig, &sa, NULL);
-}
-
-void sig_pause(void)
-{
-	sigset_t ss;
-	sigemptyset(&ss);
-	sigsuspend(&ss);
-}
-
-
 void xsetenv(const char *key, const char *value)
 {
 	if (setenv(key, value, 1))