Added proper license headers

Signed-off-by: Álvaro Jurado <elbingmiss@gmail.com>

Author: Álvaro Jurado

lib/ap/crt/crt1.c

@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2005-2014 Rich Felker, et al.
+ * Copyright (c) 2015-2018 HarveyOS et al.
+ *
+ * Use of this source code is governed by a MIT-style
+ * license that can be found in the LICENSE.mit file.
+ */
 
 #define START "_start"
 

lib/ap/plan9/__libc_start_main.c

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2005-2014 Rich Felker, et al.
+ * Copyright (c) 2015-2018 HarveyOS et al.
+ *
+ * Use of this source code is governed by a MIT-style
+ * license that can be found in the LICENSE.mit file.
+ */
+
 #include "libc.h"
 #include "sys9.h"