um: add missing declaration of 'getrlimit()' and friends

arch/um/os-Linux/start_up.c: In function 'check_coredump_limit':
arch/um/os-Linux/start_up.c:338:16: error: storage size of 'lim' isn't known
arch/um/os-Linux/start_up.c:339:2: error: implicit declaration of function 'getrlimit' [-Werror=implicit-function-declaration]

Signed-off-by: Sergei Trofimovich <[email protected]>
CC: Jeff Dike <[email protected]>
CC: Richard Weinberger <[email protected]>
CC: Al Viro <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
Signed-off-by: Richard Weinberger <[email protected]>

Author: Sergei Trofimovich

arch/um/os-Linux/start_up.c

@@ -15,6 +15,8 @@
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
 #include <asm/unistd.h>
 #include <init.h>
 #include <os.h>