Clean up trailing whitespace in the kernel headers.

And fix the scripts so they stop letting trailing whitespace through.

Change-Id: Ie109fbe1f63321e565ba0fa60fee8e9cf3a61cfc
diff --git a/libc/kernel/common/linux/if_pppox.h b/libc/kernel/common/linux/if_pppox.h
index 47ed22e..26534d7 100644
--- a/libc/kernel/common/linux/if_pppox.h
+++ b/libc/kernel/common/linux/if_pppox.h
@@ -42,8 +42,8 @@
  struct in_addr sin_addr;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-#define PX_PROTO_OE 0  
-#define PX_PROTO_OL2TP 1  
+#define PX_PROTO_OE 0
+#define PX_PROTO_OL2TP 1
 #define PX_PROTO_PPTP 2
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PX_PROTO_OLAC 3