Previously we would fail in some parts of the code if we did not have a
premade configuration, now we use any code that was marked as Linux, BSD and
Solaris as our basis in order to support building unknown Unix systems.
There were a variety of potential 64b problems due to the complete
lack of prototype declarations. So, we add a file, isam_prototypes.h,
generated mostly by the 'cproto' tool.
We also fixed up some errors that having proper prototypes pointed
out, mainly in passing ints where pointers were expected and vice
versa. The iserase() function was supposed to accept a char *, but
was defined as only accepting a char. Fun stuff like that.
