Merge pull request #24 from FGRE/master

Fix compilation with GNU compiler
Fixed compilation errors
Minor improvements
New GCM commands implemented

- NV4097_SET_DEPTH_BOUNDS_MIN
- NV4097_SET_POLY_OFFSET_FILL_ENABLE
- NV4097_SET_POLY_OFFSET_LINE_ENABLE
- NV4097_SET_POLY_OFFSET_POINT_ENABLE
- NV4097_SET_RESTART_INDEX_ENABLE
- NV4097_SET_RESTART_INDEX
Fix linking