- Added -fPIC to CXXFLAGS to prevent linking error.

- Set cmake options to get build that will be sufficient
for stuntrally package (file loader & world importer).
- Introduced new subpackages so.
- Introduced packages description macro.
- Introduced shared objects version macro.
- Added -fno-strict-aliasing compiler flag because of warning.
- Prevented openSUSE 13.2 i586 & SLE11 build failures.

- Fix CFlags in bullet.pc to not be /usr/usr upstream ticket #626
This patch has been submitted upstream by myself.
* Adds fix-pkgconfig-cflags.patch

- Update to new release 2.83.7:
* Import of URDF files, universal robot description files.
A URDF file can be imported as rigid bodies (btRigidBody) or
as multi body (btMultiBody). See the example browser under
importers.
* Improved support for btMultiBody with multi-degree of freedom
mobilizers, thanks to Jakub Stepien.
* New btGeneric6DofSpring2Constraint, replacing the old one.
Thanks to Gabor PUHR and Tamas Umenhoffer.
* OpenCL demo integrated in the ExampleBrowser. The demo is
disabled by default.
* Implicit integration of gyroscopic forces.
- Add fix-gtest.patch to fix unit tests