RFR: 6946: There should be an option to build the agent in the build script [v19]

[Marcus Hirt]

On Tue, 12 Jan 2021 21:58:34 GMT, Miroslav Wengner <mwengner at openjdk.org> wrote:

>> https://bugs.openjdk.java.net/browse/JMC-6946
>> added: 
>> - build.sh --packageAgent
>> - build.sh --runAgentExample
>
> Miroslav Wengner has updated the pull request incrementally with one additional commit since the last revision:
> 
>   6946: java version not recognized

Changes requested by hirt (Lead).

build.sh line 215:

> 213:     local agentExampleClass=$1
> 214:     if [[ -z "${agentExampleClass}" ]]; then
> 215:         err_log "error: try to run undefiend agent class, empty class"

typo undefiend -> undefined.

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PR: https://git.openjdk.java.net/jmc/pull/183