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/mc146818rtc_32.h b/libc/kernel/arch-x86/asm/mc146818rtc_32.h
index b6af33a..eff8581 100644
--- a/libc/kernel/arch-x86/asm/mc146818rtc_32.h
+++ b/libc/kernel/arch-x86/asm/mc146818rtc_32.h
@@ -26,7 +26,7 @@
 #ifndef RTC_PORT
 #define RTC_PORT(x) (0x70 + (x))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define RTC_ALWAYS_BCD 1  
+#define RTC_ALWAYS_BCD 1
 #endif
 #ifdef __HAVE_ARCH_CMPXCHG
 #include <linux/smp.h>