Make _pagesize static.

env parameter that on Windows SystemRoot is required in order
to run side-by-side assemblies.

tests by R. David Murray

introduced by r70934 that was causing a test failure when run under -O.

Fixed incorrect object passed into format_float_internal(). This was resulting in a conversion being done twice.

fix to Issue1161031, refactoring the test to simplify it in
the process.