um: get rid of pointless include "..." where include <...> will do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/os-Linux/main.c

@@ -10,11 +10,11 @@
 #include <signal.h>
 #include <string.h>
 #include <sys/resource.h>
-#include "as-layout.h"
-#include "init.h"
-#include "kern_util.h"
-#include "os.h"
-#include "um_malloc.h"
+#include <as-layout.h>
+#include <init.h>
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
 
 #define PGD_BOUND (4 * 1024 * 1024)
 #define STACKSIZE (8 * 1024 * 1024)