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-mips/asm/hardirq.h b/libc/kernel/arch-mips/asm/hardirq.h
index f3a05b4..e7b70a7 100644
--- a/libc/kernel/arch-mips/asm/hardirq.h
+++ b/libc/kernel/arch-mips/asm/hardirq.h
@@ -24,6 +24,6 @@
 typedef struct {
  unsigned int __softirq_pending;
 } ____cacheline_aligned irq_cpustat_t;
-#include <linux/irq_cpustat.h>  
+#include <linux/irq_cpustat.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif