build.gradle: use workingDir to get the vlc version

sh is not usable on Windows. Then the command is the same as for the libvlc version.

added 29 commits

• c7c3998c...a0efd040 - 28 commits from branch videolan:master
• 5d61ffc5 - build.gradle: use workingDir to get the vlc version

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enabled an automatic merge when the pipeline for 5d61ffc5 succeeds

merged