At least with KDevelop4, macros like this interefere with contextual info by
causing it to show information about the macro itself (where it's defined and
what it defines to), rather than the function (parameters, comments, etc). It
also gets in the way of auto-completion.
The reason for this is that on my system, the static or delay loaded method always picks the (obsolete) system-installed OpenAL version (needed for some old games) which is not wanted here if there's another one in the local ZDoom directory.
This also removes the dependency on the broken import library that comes with OpenAL Soft which causes compile errors with more modern MSVC compilers on default settings.
