List of the fixes:
- The headers from the .cpp files were not processed (wrong regular
expression for `awk`),
- `CGAL_COMPUTE_DEPENDENCIES` is now removed (unified with
`CGAL_ENABLE_CHECK_HEADERS`).
- All `dependencies` files has an empty line (because of
`include/CGAL/version.h` in the build directory).
- Fix the name of the target `pkg_<package>_deps`