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/backing-dev.h b/libc/kernel/common/linux/backing-dev.h
index 553cca7..2024bdc 100644
--- a/libc/kernel/common/linux/backing-dev.h
+++ b/libc/kernel/common/linux/backing-dev.h
@@ -39,15 +39,15 @@
  void (*unplug_io_fn)(struct backing_dev_info *, struct page *);
  void *unplug_io_data;
 };
-#define BDI_CAP_NO_ACCT_DIRTY 0x00000001  
+#define BDI_CAP_NO_ACCT_DIRTY 0x00000001
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define BDI_CAP_NO_WRITEBACK 0x00000002  
-#define BDI_CAP_MAP_COPY 0x00000004  
-#define BDI_CAP_MAP_DIRECT 0x00000008  
-#define BDI_CAP_READ_MAP 0x00000010  
+#define BDI_CAP_NO_WRITEBACK 0x00000002
+#define BDI_CAP_MAP_COPY 0x00000004
+#define BDI_CAP_MAP_DIRECT 0x00000008
+#define BDI_CAP_READ_MAP 0x00000010
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define BDI_CAP_WRITE_MAP 0x00000020  
-#define BDI_CAP_EXEC_MAP 0x00000040  
+#define BDI_CAP_WRITE_MAP 0x00000020
+#define BDI_CAP_EXEC_MAP 0x00000040
 #define BDI_CAP_VMFLAGS   (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP)
 #if defined(VM_MAYREAD) && BDI_CAP_READ_MAP != (VM_MAYREAD || BDI_CAP_WRITE_MAP != (VM_MAYWRITE || BDI_CAP_EXEC_MAP != VM_MAYEXEC))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */