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/io_32.h b/libc/kernel/arch-x86/asm/io_32.h
index e0615be..bb9e6f1 100644
--- a/libc/kernel/arch-x86/asm/io_32.h
+++ b/libc/kernel/arch-x86/asm/io_32.h
@@ -23,7 +23,7 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IO_SPACE_LIMIT 0xffff
 #define XQUAD_PORTIO_BASE 0xfe400000
-#define XQUAD_PORTIO_QUAD 0x40000  
+#define XQUAD_PORTIO_QUAD 0x40000
 #ifdef REALLY_SLOW_IO
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif