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/siginfo.h b/libc/kernel/arch-mips/asm/siginfo.h
index 8fdbf77..8412ac1 100644
--- a/libc/kernel/arch-mips/asm/siginfo.h
+++ b/libc/kernel/arch-mips/asm/siginfo.h
@@ -19,7 +19,7 @@
 #ifndef _ASM_SIGINFO_H
 #define _ASM_SIGINFO_H
 #define __ARCH_SIGEV_PREAMBLE_SIZE (sizeof(long) + 2*sizeof(int))
-#undef __ARCH_SI_TRAPNO  
+#undef __ARCH_SI_TRAPNO
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define HAVE_ARCH_SIGINFO_T
 #define HAVE_ARCH_COPY_SIGINFO
@@ -91,8 +91,8 @@
 #undef SI_TIMER
 #undef SI_MESGQ
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SI_ASYNCIO -2  
-#define SI_TIMER __SI_CODE(__SI_TIMER, -3)  
-#define SI_MESGQ __SI_CODE(__SI_MESGQ, -4)  
+#define SI_ASYNCIO -2
+#define SI_TIMER __SI_CODE(__SI_TIMER, -3)
+#define SI_MESGQ __SI_CODE(__SI_MESGQ, -4)
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */