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/elf_aux.c

@@ -9,9 +9,9 @@
  */
 #include <elf.h>
 #include <stddef.h>
-#include "init.h"
-#include "elf_user.h"
-#include "mem_user.h"
+#include <init.h>
+#include <elf_user.h>
+#include <mem_user.h>
 
 typedef Elf32_auxv_t elf_auxv_t;