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/linux/perf_event.h b/libc/kernel/common/linux/perf_event.h
index f039a6d..ad5515f 100644
--- a/libc/kernel/common/linux/perf_event.h
+++ b/libc/kernel/common/linux/perf_event.h
@@ -112,7 +112,7 @@
  PERF_FORMAT_MAX = 1U << 4,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-#define PERF_ATTR_SIZE_VER0 64  
+#define PERF_ATTR_SIZE_VER0 64
 struct perf_event_attr {
  __u32 type;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */