Add *Config.cmake files to the SYSTEM_SEARCH variable, so that
mk/sysdep/cmake.mk automatically computes the cmake *_DIR variables for
packages using this dependency.

Setting CMAKE_PREFIX_PATH is useless. Since each dependency may be located in
its own path, one must pass to cmake the proper _DIR variables.

This is handled automatically by mk/sysdep/cmake.mk when a dependency
SYSTEM_SEARCH variable lists the *Config.cmake files whose path must be fed to
cmake.

Needed to access specific part of talos-ros-control.

- Connect the toplevel Makefile
- Prevent binary/source redistribution (according to the LICENSE)
- Drop inclusion of ros-basæMakefile.common: this is not a ros package
- Drop wrong python substitutions (with non existing files)
- Add missing dependencies, in particuler C and C++ compilers
- Whitespace/formatting cleanup in the depend.mk