[Merge] lp:~khurshid-alam/unity-api/fix-build-cosmic into lp:unity-api

[Khurshid Alam]

The proposal to merge lp:~khurshid-alam/unity-api/fix-build-cosmic into lp:unity-api has been updated.

Commit message changed to:

* Satisfy build against >= gcc-7

* Only add internal header tests if exists.

Only add a test for standalone compilation of internal include
directories if the directory exists on disk.

https://github.com/ubports/unity-api/commit/89b77f91f746cca9aa71f1e44a896e51f5b2a9fd

* Fix autoclean conflict with new glib.

The new glib 2.57.2 version introduces reference counted strings, which
causes a redefinition scenario with the autocleanup of gchar here. So,
only include this definition when building against older glib versions.

https://github.com/ubports/unity-api/commit/9e7c45340805532faf4078012b17c8719677714e

* Raplace transitional dummy packages qtquick2 and qttest

* Disable memory tests for now to satisfy build against glib >= 2.58.

For more details, see:
https://code.launchpad.net/~khurshid-alam/unity-api/fix-build-cosmic/+merge/356161
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