fix: `MP_UNITS_BUILD_IMPORT_STD` verification fixed #1

Job	Run time
std::format none C++20 Clang-18 Release	6m 40s
std::format none C++20 Clang-18 Debug	6m 19s
std::format none C++23 Clang-18 Release	2m 1s
std::format none C++23 Clang-18 Debug	1m 41s
std::format gsl-lite C++20 Clang-18 Release	6m 44s
std::format gsl-lite C++20 Clang-18 Debug	6m 26s
std::format gsl-lite C++23 Clang-18 Release	2m 1s
std::format gsl-lite C++23 Clang-18 Debug	1m 45s
std::format ms-gsl C++20 Clang-18 Release	7m 26s
std::format ms-gsl C++20 Clang-18 Debug	7m 11s
std::format ms-gsl C++23 Clang-18 Release	2m 0s
std::format ms-gsl C++23 Clang-18 Debug	1m 48s
fmtlib none C++20 Clang-18 Release	6m 53s
fmtlib none C++20 Clang-18 Debug	6m 18s
fmtlib none C++23 Clang-18 Release	1m 59s
fmtlib none C++23 Clang-18 Debug	1m 45s
fmtlib gsl-lite C++20 Clang-18 Release	6m 59s
fmtlib gsl-lite C++20 Clang-18 Debug	6m 20s
fmtlib gsl-lite C++23 Clang-18 Release	1m 52s
fmtlib gsl-lite C++23 Clang-18 Debug	1m 46s
fmtlib ms-gsl C++20 Clang-18 Release	6m 48s
fmtlib ms-gsl C++20 Clang-18 Debug	6m 30s
fmtlib ms-gsl C++23 Clang-18 Release	2m 12s
fmtlib ms-gsl C++23 Clang-18 Debug	1m 51s
	1h 43m 15s

Provide feedback