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-arm/asm/stat.h b/libc/kernel/arch-arm/asm/stat.h
index 0a6d036..d8188bf 100644
--- a/libc/kernel/arch-arm/asm/stat.h
+++ b/libc/kernel/arch-arm/asm/stat.h
@@ -34,7 +34,7 @@
  unsigned long st_mtime;
  unsigned long st_ctime;
 };
-#define STAT_HAVE_NSEC 
+#define STAT_HAVE_NSEC
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct stat {
 #ifdef __ARMEB__