FELIX-4026 Ensure Java 1.4 API use and class files

- generate 1.4 class files
- check Java 1.4 API use
- Resolve current non-Java 1.4 API use

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1468913 13f79535-47bb-0310-9956-ffa450edef68