build and cache abseil separately on appveyor #2349
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This brings down appveyor build times a bit.
Unfortunately the abseil dependencies have different names through cmake, requiring either multiple lookups or meson >= 0.60. I chose the second option as cleaner.
There was another alternative, to only use the cmake dependency name, but this gives the following string of warnings that I would prefer to avoid if possible (i.e. when pkg-config is available):