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>
diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c
index ba7363e..bdaa08c 100644
--- a/arch/x86/um/signal.c
+++ b/arch/x86/um/signal.c
@@ -11,8 +11,8 @@
 #include <asm/unistd.h>
 #include <asm/uaccess.h>
 #include <asm/ucontext.h>
-#include "frame_kern.h"
-#include "skas.h"
+#include <frame_kern.h>
+#include <skas.h>
 
 #ifdef CONFIG_X86_32