creddit: libreddit: Small fix to debug.h and version numbering

The first small fix here simply changes debug.h to include <wchar.h> and <stdio.h> in the event the debugging is turned on, as it uses functions from those headers.

The second change moves the definition of the LIBREDDIT_VERSION macro out of libreddit/global.h and into the libreddit/libreddit.mk file. At the moment the version number itself is somewhat meaning less, but it'll be helpful in the future to be able to easily change the version number.