Fix some broken declarations and imports when not HAVE_LONG_DOUBLE

[embray]

I feel like there's got to be a way to more cleanly manage imports for optionally defined types as in the HAVE_LONG_DOUBLE and HAVE_QD cases. I'll have to think about that more in the meantime.

[embray]

Or if nothing else maybe I could add some configurations on the travis build to test these special cases, or at least that it builds.

[malb]

Adding Travis-CI tests for this would be ace!

[embray]

Yeah I was thinking that would at least be a start. I'll gladly take care of it, as long as you don't mind adding a couple additional test configurations.

[malb]

Adding a couple of test configurations sounds fine to me, I'd rather have tests that make it works than quick ones that don't tell the full story.

[embray]

Should be fixed now.