* guix/build-system/ant.scm: Add #:test-include and #:test-exclude
arguments.
* guix/build/ant-build-system.scm: Generate test list from arguments.
* doc/guix.texi (Build Systems): Document it.
* guix/build-system/ant.scm: New #:main-class argument
* guix/build/ant-build-system.scm: Generate a manifest file with
additional properties.
* doc/guix.texi (Build Systems): Document it.
* guix/build/java-utils.scm: New file.
* guix/build-system/ant.scm: Use it.
* Makefile.am (MODULES): Add it.
Co-authored-by: Ricardo Wurmus <rekado@elephly.net>