Don't install cythonize dependencies unless cythonizing #1405
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Numpy is not building in my environment, but I should not need to have it if all I want to build is the default libvmaf target.
Additionally:
Instead of using the mtime of the .venv directory as a marker for whether meson and ninja were successfully installed, use their wrapper scripts from .venv/bin.
The $(VENV) target uses set -e and escaped newlines to run all commands in a single shell invocation. Unless these commands are modifying the shell's environment, this is redundant and mimics the way make already works when you put a single command on each line.