reverts a small part of 845c2c5

the File constructor seems to be unable to parse URLs created from
URIs sometimes, leading to a test failure. Most likely the spaces or
parentheses inside of the path of the jenkins workspaces are
responsible.

classes from ant-launcher.jar cannot load classes from ant.jar because
of the way we structure classloaders.

This reverts part of 66d7986

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Merge tag 'rel/1.10.3'

Tagging version 1.10.3 of Ant

# gpg: WARNING: unsafe permissions on homedir '/home/stefan/.gnupg'
# gpg: keyserver option 'ca-cert-file' is obsolete; please use 'hkp-cacert' in dirmngr.conf
# gpg: keyserver option 'no-try-dns-srv' is unknown
# gpg: Signature made Di 27 Mär 2018 20:20:02 CEST
# gpg:                using DSA key A2115AE15F6B8B72
# gpg:                issuer "bodewig@apache.org"
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: key 0000000000000000 occurs more than once in the trustdb
# gpg: Good signature from "Stefan Bodewig <bodewig@apache.org>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan.bodewig@freenet.de>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan@samaflost.de>" [ultimate]
# Primary key fingerprint: CE80 75A2 5154 7BEE 249B  C151 A211 5AE1 5F6B 8B72