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/arch-x86/asm/pgalloc_32.h b/libc/kernel/arch-x86/asm/pgalloc_32.h
index 022ca61..2490473 100644
--- a/libc/kernel/arch-x86/asm/pgalloc_32.h
+++ b/libc/kernel/arch-x86/asm/pgalloc_32.h
@@ -19,7 +19,7 @@
 #ifndef _I386_PGALLOC_H
 #define _I386_PGALLOC_H
 #include <linux/threads.h>
-#include <linux/mm.h>  
+#include <linux/mm.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define paravirt_alloc_pt(mm, pfn) do { } while (0)
 #define paravirt_alloc_pd(pfn) do { } while (0)