Cross Reference: /external/nanopb-c/tests/regression/issue_172

`Name`	`Date`	`Size`
Up to higher level directory
`msg_size.c`	22-Oct-2020	`129`
`SConscript`	22-Oct-2020	`495`
`submessage/`	22-Oct-2020
`test.proto`	22-Oct-2020	`101`