Merge branch 'rs/zip-tests'

Update zip tests to skip some that cannot be handled on platform unzip. * rs/zip-tests: t5003: check if unzip supports symlinks t5000, t5003: move ZIP tests into their own script t0024, t5000: use test_lazy_prereq for UNZIP t0024, t5000: clear variable UNZIP, use GIT_UNZIP instead