winapinls.cpp: static_assert is_sorted() for the lookup tables

[StephanTLavavej]

After #6 is implemented, we should use constexpr is_sorted() in winapinls.cpp.

[BillyONeal]

Note that we compile that thing with MSVC, so even though we can implement #6 now because Clang has support for is_constant_evaluated, we need MSVC to support that before attempting to resolve this item.

[StephanTLavavej]

Also applies to the validate.cpp tool:

STL/tools/validate/validate.cpp

Lines 173 to 176 in f9b1dcc

	// TRANSITION, P0202R3, use constexpr is_sorted()
	assert(is_sorted(skipped_directories.begin(), skipped_directories.end()));
	assert(is_sorted(skipped_extensions.begin(), skipped_extensions.end()));
	assert(is_sorted(tabby_filenames.begin(), tabby_filenames.end()));