Correct Realtek post-build script to work in the online compiler

[theotherjimmy]

Resolves #5976

[cmonr]

@JanneKiiskila Do you think you could review/test this really quick? It's a small change and once merged, we could close the Online Compiler bug.

[theotherjimmy]

@cmonr This change is already live in the online complier, so we could mark the bug fixed now. This is the "up-streaming" effort.

[cmonr]

Ah, nice. Is the "partnerbeta" thing something that we could publicly link here? If not, then that's fine.

[cmonr]

/morph build

[mbed-ci]

Build : FAILURE

Build number : 1367
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6216/

[cmonr]

Looks like it did not like compiling LWIP. Also, there are quite a few TypeErrors.

[samchuarm]

@prashantrar

[samchuarm]

Is anything needed from Realtek side to address?

[theotherjimmy]

Not yet. I have to figure out what when wrong with those 3 builds.

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1471
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6216/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1117
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6216/

[mbed-ci]

Test : FAILURE

Build number : 1248
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6216/1248

[0xc0170]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 1255
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6216/1255