um: fill the handlers array at build time

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/skas/process.c b/arch/um/os-Linux/skas/process.c
index 31743f1..f4e02ad 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -659,7 +659,7 @@
 {
 	int n;
 
-	set_handler(SIGWINCH, (__sighandler_t) sig_handler);
+	set_handler(SIGWINCH);
 
 	/*
 	 * Can't use UML_SETJMP or UML_LONGJMP here because they save