Libport.UFloat: fix tests.
Libport.UFloat: fix tests.

	* tests/libport/ufloat-common.cc: G++ does check the validity of
	the code in else branches of "if (false)".  So instead of fighting
	to use static ifs, ensure types using ctors.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport