um: don't bother blocking SIGARLM and SIGUSR1

We used to generate those, but we hadn't done that for a long
time.  No need to bother blocking them for signal handlers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 0ced30c..c1a8fa7 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -236,20 +236,19 @@
 void init_new_thread_signals(void)
 {
 	set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	signal(SIGHUP, SIG_IGN);
 
 	set_handler(SIGIO, (__sighandler_t) sig_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGALRM,
-		    SIGVTALRM, -1);
+		    SA_ONSTACK | SA_RESTART, SIGIO, SIGWINCH, SIGVTALRM, -1);
 	signal(SIGWINCH, SIG_IGN);
 	signal(SIGTERM, SIG_DFL);
 }