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/x86/um/ptrace_user.c

@@ -4,7 +4,7 @@
  */
 
 #include <errno.h>
-#include "ptrace_user.h"
+#include <ptrace_user.h>
 
 int ptrace_getregs(long pid, unsigned long *regs_out)
 {