antlr-bootstrap-2.7.7-160000.2.2

- Use SOURCE_DATE_EPOCH for reproducible builds

- Clean the spec file and use javapackages-local >= 6 features

- Add _multibuild to define additional spec files as additional
  flavors.
  Eliminates the need for source package links in OBS.

- Use FAT LTO objects in order to provide proper static library.

- Drop unused BuildRequires: zip+unzip

- Speed-up build by compiling all *.java files in one javac
  invocation

- Build with source and target 8 to prepare for a possible removal
  of 1.6 compatibility

- Escape the usage of %{VERSION} when calling out to rpm.
  RPM 4.14 has %{VERSION} defined as 'the main packages version'.

- Remove requirement of gcc-java all together and build with
  any java version that exists and is able to use source and target
  1.6

- Remove requirements of ecj-bootstrap and fastjar
  * use the gcj.jar that comes with gccN-java
  * use gjar-N instead of fastjar