Box2D-2.3.1-bp151.2.16

- Replace strange buildroot definition

- RPM group correction

- Fixed Factory review (License.txt is not packaged).
- Minor spec clean-up (may fix SLE build).
- Cmake release with debug info build type.

- Fixed tar.gz by osc service localrun download_files
- Fixed version in baselibs.conf (for 32bits packages)
- Added baselibs.conf as source1

- Update to new upstream version 2.3.1:
  * Polygon creation now computes the convex hull.
  * The convex hull code will merge vertices closer than
  dm_linearSlop.
  * Vertices no longer need to be ordered.
  * New GUI
  * Various other bugfixes
- removed upstream patched Box2D_v2.2.1-lib64.patch
- replaced Box2D_v2.2.1-version.patch with
  Box2D-fix-version-2.3.1.patch

- new package