PATCH: Auto detect HOST_64BIT_TYPE and HOST_U_64BIT_TYPE

[Ian Lance Taylor]

"H. J. Lu" <hjl@lucon.org> writes:

> There is no need to hard code HOST_64BIT_TYPE nor HOST_U_64BIT_TYPE. We
> can auto detect them. Here is the patch.

I think we might as well eliminate host64 at the same time.  It
doesn't add much, and will simplify configure.host even more.  We can
set host64 if sizeof(long) == 8, if that seems helpful.

Ian