Bug 687518

jasper.h includes among other things jas_types.h, which doesn't so much define
types used by the libjasper api as pull in a bunch of headers and basic typedefs
for the convenience the of the library's own compile, polluting the namespace of
the client application.

In particular, the inclusiong of stdbool.h is causing a conflict with
Ghostscript's local definition of the bool type on some systems.

This, and probably significant other parts of the jasper includes should be
internalized to private headers and not exported to clients.