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/skbuff.h b/libc/kernel/common/linux/skbuff.h
index d52b46c..a35abf9 100644
--- a/libc/kernel/common/linux/skbuff.h
+++ b/libc/kernel/common/linux/skbuff.h
@@ -36,8 +36,8 @@
 #include <net/checksum.h>
 #include <linux/dmaengine.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define HAVE_ALLOC_SKB  
-#define HAVE_ALIGNABLE_SKB  
+#define HAVE_ALLOC_SKB
+#define HAVE_ALIGNABLE_SKB
 #define CHECKSUM_NONE 0
 #define CHECKSUM_HW 1
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */