travis-ci: diable mac builds to avoid timeouts

[PrzemoF]

Signed-off-by: Przemo Firszt przemo@firszt.eu

Thank you for creating a pull request to contribute to FreeCAD! To ease integration, please confirm the following:

• Branch rebased on latest master git pull --rebase upstream master
• [N/A] Unit tests confirmed to pass by running ./bin/FreeCAD --run-test 0
• Commit message is well-written
• [N/A] Commit message includes issue #<id> or fixes #<id> where <id> is the associated MantisBT issue id if one exists

And please remember to update the Wiki with the features added or changed once this PR is merged.
Note: If you don't have wiki access, then please mention your contribution on the 0.19 Changelog Forum Thread.

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[PrzemoF]

I'm not sure if I disabled all mac parts, so please do not merge until the checks are completed

[abdullahtahiriyo]

Travis was not properly triggered or it has lost the PR:
https://travis-ci.org/github/FreeCAD/FreeCAD/builds

If you want the CI to pass, you might have to retrigger the PR.

[PrzemoF]

Thanks, I've done it.
Edit: or maybe not.. I'll close this one and open another