concurrent-1.3.4-bp155.2.12

- Allow building with other JDK then gcj
- Build with java source and target level 1.6 in order to allow
  building with jdk9
- Added patch:
  * concurrent-jdk8.patch
    + Fix a name clash that exist from jdk8

- Fix building with java properly, use gcj as anything newer fails
  to compile this

- don't use icecream
- use source="1.4" and target="1.4" for build with java 1.5

- converted neededforbuild to BuildRequires

- Adjustments in the spec file.

- Current version 1.3.4 from JPackage.org

- update to version 1.3.4
- don't use icecream

- Fix prerequires of javadoc subpackage

- Initial package created with version 1.3.2 (JPackage 1.5)