Import bb40c55f6b: Updated macOS pipeline to use Xcode (by Maki)

[daleglass]

This is an automated proposal to look at a commit made by Maki and import it into Overte

Commit:	bb40c55f6b2585e461da708e3efbaa7e3453e308
Author:	Maki
Date:	Tue, 21 Apr 2020 13:16

Updated macOS pipeline to use Xcode

Stats:

Filename	Stats	Lines	Added	Removed	Lines in blame
.gitlab/build/macos.gitlab-ci.yml		15	6	9	⚠ 0
1 files	-	15	6	9	0

To work on this, please assign the issue to yourself, then look at the commit and decide whether this would be a good addition to Overte.

• If the commit is useful, tag it with "Tivoli: Keep", and keep it open until it's merged.
• If the commit is not useful, tag it with "Tivoli: Discard", and close it.
• If the commit is not useful right now, but might be later, tag it with "Tivoli: Maybe later", and close it.
• If it's hard to decide, tag it with "Tivoli: Discuss", and keep it open.

Useful commits should be submitted as a PR against Overte. Tag this issue in PR, so that it's automatically closed once the PR is merged.

You can cherry-pick this issue with this command:

git cherry-pick bb40c55f6b2585e461da708e3efbaa7e3453e308