core: Drop build date from version to make the project reproducible

[SunilMohanAdapa]

Closes: #111.

Reproducible builds are an important way to independently verify the integrity of the binaries. See the argument for reproducible builds[1].

The jar file minidns-core-1.0.0.jar contains the file org.minidns/version which in turn contains the date of the build. When built on different dates this leads to different jar files.

Tests:

• Build succeeds with the build date dropped.
• The version in file org.minidns/version is '1.0.0 (non-git build)'.
• minidns can be built reproducibly[2].

Links:

1) https://reproducible-builds.org/ 2) https://salsa.debian.org/debian/libminidns-java/-/jobs/1616137

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org Tested-by: Sunil Mohan Adapa sunil@medhas.org

[coveralls]

Pull Request Test Coverage Report for Build 209

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 52.721%

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Totals
Change from base Build 193:	0.02%
Covered Lines:	2916
Relevant Lines:	5531

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💛 - Coveralls