Create default manpage when setting default java environment, fix license, fixes #4

Erwin Iosefrequested to merge
erwin-iosef/java-common:fixpkg into main

With this change, when you set a new default jdk environment, archlinux-java will also create a javac.1 symlink in /usr/share/man/man1 to the corresponding default jdk environment, the link gets removed via the unlink() call in archlinux-java and so gets removed when you remove the default set jdk pkg/when you remove java-runtime-common. It also respects tests in test_archlinux-java.

Fixed the pkg licensing to 'GPL-1.0-or-later'.

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