creddit: libreddit: Make debug.h include needed headers

debug.h needs the <stdio.h> and <wchar.h> headers included to function.
This patch simply adds #include lines for those files in to debug.h.
They are, however, only included if the REDDIT_DEBUG flag is set, as
they are not neeeded otherwise.
libreddit: Unify the specification of the version number

This patch simply removes the definition of the version number of
libreddit from ./libreddit/global.h, and instead uses the -D compiler
flag to define the value at compilation from the libreddit/libreddit.mk
file. This way, the version number is only specified in
./libreddit/libreddit.mk, and that number is used everywhere in the
program.
Merge pull request #59 from DSMan195276/small-fixes

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