Cross Reference: /external/nanopb-c/tests/regression/issue_125

`Name`	`Date`	`Size`
Up to higher level directory
`extensionbug.expected`	22-Oct-2020	`53`
`extensionbug.options`	22-Oct-2020	`80`
`extensionbug.proto`	22-Oct-2020	`231`
`SConscript`	22-Oct-2020	`242`