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/ucontext.h b/libc/kernel/arch-x86/asm/ucontext.h
index e2326e5..9ceffac 100644
--- a/libc/kernel/arch-x86/asm/ucontext.h
+++ b/libc/kernel/arch-x86/asm/ucontext.h
@@ -18,7 +18,7 @@
  ****************************************************************************/
 #ifndef _ASM_X86_UCONTEXT_H
 #define _ASM_X86_UCONTEXT_H
-#define UC_FP_XSTATE 0x1  
+#define UC_FP_XSTATE 0x1
 #include <asm-generic/ucontext.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif