Export, MCUXpresso: Avoid assigning self.libraries

[theotherjimmy]

Description

At some point in the past, self.libraries was changed from "assignable"
to not allowing assignment. This PR changes the MCUXpresso exporter to
avoid assigning this variable, and therefore fixes the exporter.

Pull request type

[x] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[0xc0170]

I assume branch was created from dm subcommand one not master (extra commits here?) ?

[cmonr]

Just gonna wait until #7844 comes in, since that will collapse the PR changeset.

[0xc0170]

Just gonna wait until #7844 comes in, since that will collapse the PR changeset.

@cmonr Please review, 7844 was integrated

[0xc0170]

Looking at the history, might need a rebase to clean it

[theotherjimmy]

Rebasing. For some reason I did not get emails from this thread.

[theotherjimmy]

@0xc0170 Rebase done.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3298
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7937/

Triggering tests

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

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2928
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7937/

[mbed-ci]

Test : SUCCESS

Build number : 3107
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7937/3107

[NirSonnenschein]

@cmonr passed CI, but only your review, does this require a tech-lead to move to "ready to merge"?

[cmonr]

@NirSonnenschein
@theotherjimmy is effectively the tools tech lead. If we really want, we could ask @bridadan to also look, but when I'm not doing maintainer-y things, my time is spent working on tools :)

[NirSonnenschein]

@cmonr , I get all of what you are saying and if you are ok with this then it is fine.