pcr: slf4j: add unzip forgotten depdency
Without that fix, it wokrs fine with makepkg but fails with libremakepkg
with the following error:
| ==> Starting prepare()...
| /startdir/PKGBUILD: line 141: unzip: command not found
| ==> ERROR: A failure occurred in prepare().
| Aborting...
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>