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/common/asm-generic/signal.h b/libc/kernel/common/asm-generic/signal.h
index f106b38..7f24717 100644
--- a/libc/kernel/common/asm-generic/signal.h
+++ b/libc/kernel/common/asm-generic/signal.h
@@ -21,14 +21,14 @@
 #include <linux/compiler.h>
 #ifndef SIG_BLOCK
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIG_BLOCK 0  
+#define SIG_BLOCK 0
 #endif
 #ifndef SIG_UNBLOCK
-#define SIG_UNBLOCK 1  
+#define SIG_UNBLOCK 1
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef SIG_SETMASK
-#define SIG_SETMASK 2  
+#define SIG_SETMASK 2
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef __ASSEMBLY__
@@ -37,9 +37,9 @@
 typedef void __restorefn_t(void);
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 typedef __restorefn_t __user *__sigrestore_t;
-#define SIG_DFL ((__force __sighandler_t)0)  
-#define SIG_IGN ((__force __sighandler_t)1)  
-#define SIG_ERR ((__force __sighandler_t)-1)  
+#define SIG_DFL ((__force __sighandler_t)0)
+#define SIG_IGN ((__force __sighandler_t)1)
+#define SIG_ERR ((__force __sighandler_t)-1)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #endif