[appveyor] Fix cache handling #19587
Merged
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I noticed that the cache for the c:\php dir was almost always skipped. After looking more carefully at appveyor's doc, there is only one cache for all branches/PRs.
Which means we can't have variations for cached items in the same way we have on travis.
Thus, we can only cache things that are the same across all branches. Namely our phpunit wrapper and composer.phar.