Do not call pkg_check_module if the MODULE_FOUND is already cached

Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

cmake: Improve the usage of PARENT_SCOPE

Look for uuid/uuid.h instead of just uuid.h

Avoids a conflict between /usr/include/uuid.h and
/usr/local/include/uuid/uuid.h on freebsd

louloulibs is directly included, instead of being a submodule

Because this is a nightmare to manage