AP_Scritping: remove more libraries from the sandbox

libraries/AP_Scripting/lua/src/linit.c

@@ -41,15 +41,15 @@
 */
 static const luaL_Reg loadedlibs[] = {
   {"_G", luaopen_base},
-  {LUA_LOADLIBNAME, luaopen_package},
+//  {LUA_LOADLIBNAME, luaopen_package},
 //  {LUA_COLIBNAME, luaopen_coroutine},
   {LUA_TABLIBNAME, luaopen_table},
 //  {LUA_IOLIBNAME, luaopen_io},
-  {LUA_OSLIBNAME, luaopen_os},
+//  {LUA_OSLIBNAME, luaopen_os},
   {LUA_STRLIBNAME, luaopen_string},
   {LUA_MATHLIBNAME, luaopen_math},
   {LUA_UTF8LIBNAME, luaopen_utf8},
-  {LUA_DBLIBNAME, luaopen_debug},
+//  {LUA_DBLIBNAME, luaopen_debug},
 #if defined(LUA_COMPAT_BITLIB)
   {LUA_BITLIBNAME, luaopen_bit32},
 #endif

libraries/AP_Scripting/scripts/sandbox.lua

@@ -26,7 +26,6 @@ function get_sandbox_env ()
                     sort = table.sort },
           utf8 = { char = utf8.char, charpattern = utf8.charpattern, codes = utf8.codes,
                    codepoint = utf8.codepoint, len = utf8.len, offsets = utf8.offsets},
-          os = { clock = os.clock, difftime = os.difftime, time = os.time },
 
           -- ArduPilot specific
           gcs = { send_text = gcs.send_text},