um: auxvec.h is never used

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

arch/um/include/asm/auxvec.h

@@ -1,4 +0,0 @@
-#ifndef __UM_AUXVEC_H
-#define __UM_AUXVEC_H
-
-#endif