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/cmpxchg_32.h b/libc/kernel/arch-x86/asm/cmpxchg_32.h
index 0da9b38..588a0f1 100644
--- a/libc/kernel/arch-x86/asm/cmpxchg_32.h
+++ b/libc/kernel/arch-x86/asm/cmpxchg_32.h
@@ -18,7 +18,7 @@
  ****************************************************************************/
 #ifndef __ASM_CMPXCHG_H
 #define __ASM_CMPXCHG_H
-#include <linux/bitops.h>  
+#include <linux/bitops.h>
 #define xchg(ptr,v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v),(ptr),sizeof(*(ptr))))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct __xchg_dummy { unsigned long a[100]; };