+ libexternalsortinginjava-java, libexternalsortinginjava-java-doc: Add Multi-Arch: foreign.

Changes-By: apply-multiarch-hints

Changes-By: lintian-brush
Fixes: lintian: upstream-metadata-file-is-missing
See-also: https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html
Fixes: lintian: upstream-metadata-missing-bug-tracking
See-also: https://lintian.debian.org/tags/upstream-metadata-missing-bug-tracking.html

Changes-By: lintian-brush
Fixes: lintian: trailing-whitespace
See-also: https://lintian.debian.org/tags/trailing-whitespace.html

Update to upstream version '0.6.1'
with Debian dir 59df01c6ed809bfc388c9b0e2a806934d25daf6b

Update to upstream version '0.2.5'
with Debian dir 0723cd6d90c44a50c82cbdd5381265a262eb3088

Update to upstream version '0.2.4'
with Debian dir cbbe302bced2888d005e80d0714becdc9d15634b