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ci: add osx homebrew packages to cache

Authored by zmike on Jul 12 2018, 7:05 AM.

Description

ci: add osx homebrew packages to cache

this adds the downloaded homebrew package files to a cache in order to
avoid needing to separately download each file at the start of each build

not sure we can do better here unless we buy the enterprise-level travis
package which allows building with custom osx images which we could pre-install
all these dependencies on

ref T7096

Differential Revision: https://phab.enlightenment.org/D6610

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