osx: add some common paths to our $PATH when started from bundle

with the previous commit we removed the ability of loading the standard
shell environment. this exact behaviour can only be re-added by either
invoking the standard shell in a background process and reading it's
environment vars or by manually reading all the various shell configs.
both ways are kinda dirty and the former was already rejected before.
for now we will just add some commonly used paths, when started from the
bundle, so it can find the binaries used by mpv again. for example the
youtube-dl one for our youtube-dl hook.

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