using C++20 modules requires improvement

[KostinPavel]

Expected Behavior

MSCV error:
the "module" directive cannot be in the scope of conditional inclusion (for example, #if, #else, #elseif, etc.)

1. error C3378: The declaration can only be exported from the module interface block
2. error C2230: the module "boost.ut" could not be found
3. warning C5244: "#include <iso646.h>" in the purview of the module "boost.ut" is displayed incorrectly. It is recommended to move this directive before declaring the module or replace the text inclusion with "import <iso646.h>;"
4. warning C5244: "#include " in the purview of the module "boost.ut" is displayed incorrectly. It is recommended to move this directive before declaring the module or replace the text inclusion with "import ;"
   etc.
   Code refactoring is required.

Actual Behavior

using C++20 modules

Steps to Reproduce the Problem

1. build use msvc compiller with BOOST_UT_DISABLE_MODULE = OFF

Specifications

• Version: 1.1.9
• Platform: Windows
• Subsystem: Ninja, cmake, MSVC 19.35.32215.0