gnu-regexp-1.1.4-bp150.2.3

- Build with source and target level 1.6 in order to allow building
  with jdk9

- Drop obsolete dependency

- Clean up with spec-cleaner

- drop dir attribute from gnu.regexp symlink

- add gnu-regexp jars to make build-classpath works as expected

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

- converted neededforbuild to BuildRequires

- fix demo package requires

- Current version 1.1.4 from JPackage.org