FindJava.cmake: handle new openjdk versioning

The fix for #17613 (closed) (merge !1637 (merged)) does not take into account JEP-223 where the java versioning changed from the "1.VV" format to "VV".

The right way to compare versions should be to replace the current Java_VERSION VERSION_LESS "1.10" with Java_VERSION VERSION_LESS "10".

Edited Apr 24, 2018 by Tiago Daitx

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