Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/linux/magic.h b/libc/kernel/uapi/linux/magic.h
index bf57a58..f3b337e 100644
--- a/libc/kernel/uapi/linux/magic.h
+++ b/libc/kernel/uapi/linux/magic.h
@@ -78,6 +78,7 @@
 #define DAXFS_MAGIC 0x64646178
 #define BINFMTFS_MAGIC 0x42494e4d
 #define DEVPTS_SUPER_MAGIC 0x1cd1
+#define BINDERFS_SUPER_MAGIC 0x6c6f6f70
 #define FUTEXFS_SUPER_MAGIC 0xBAD1DEA
 #define PIPEFS_MAGIC 0x50495045
 #define PROC_SUPER_MAGIC 0x9fa0