<cucul.h> will provide the C99 types, even if libcaca has been installed.
* Rename what's left of "common.h" to "stubs.h".
* Remove all references to erroneous <inttypes.h> from source files.
just need to include <caca0.h> instead of <caca.h> and should be source-
compatible with old versions of libcaca.
Most of the old API works, except features and caca_sqrt(). Sprites do
work API-wise but due to the new format they are no longer working in
the same way.