One is a way to export symbols, the other a way to reference
API functions. Also include prebuilt dlljanet.dll and dlljanet.lib
for windows to save people the trouble of compiling janet.c themselves.
JPM and related functionality has been moved to it's own repository
and will be versioned separately from Janet. The distribution process
could later be modified to bundle a version of jpm with Janet but this
is perhaps not needed.
