w32_regex_traits: BASETYPES does not imply LCTYPE (and other symbols)

When specific Windows headers are selectively included before boost/regex is included, `w32_regex_traits.hpp` incorrectly assumes `LCTYPE` and various other symbols are defined.

This appears to be due to the check for `BASETYPES`:

https://github.com/boostorg/regex/blob/f851a08050dd6d4bdea552d2cf614c69d8d3cff9/include/boost/regex/v5/w32_regex_traits.hpp#L121

This macro is defined in `minwindef.h`, But `LCTYPE` is actually defined in `winnls.h`. This check only holds if `minwindef.h` is transitively included through `windows.h`, which will itself include `winnls.h`.

As such, the following minimum example code fails to compile with the following error:

```c++
#define _AMD64_ // assuming x64
#include
#include
```
```
C:\.conan\3072f8\1\include\boost-1_86\boost\regex\v5\w32_regex_traits.hpp(200): error C2061: syntax error: identifier 'LCTYPE'
// various other errors for unknown identifiers
```

In my project, this problem appeared after updating [CLI11](https://github.com/CLIUtils/CLI11) from 2.1.2 to 2.4.2. In header-only mode, the new version includes only a few Windows headers in its implementation ([link](https://github.com/CLIUtils/CLI11/blob/v2.4.2/include/CLI/impl/Argv_inl.hpp#L48)).