Fixup the static binaries check

It did set a variable which wasn't used (debug)
and didn't display a result.

Now we display the default, and yes/no properly

This still doesn't change the fact that --enable-static-binaries
doesn't do the right thing, but I'll fix that in another patch.
Merge pull request #1766 from rubenk/fixup-static-binaries-check

Fixup the static binaries check