Fully isolate windows.h includes to source files

[ZeroMemes]

windows.h has a lot of transitive includes, and subsequently undesired macro definitions, that are not required for cpptrace's functionality. This change simply substitutes windows.h for excpt.h in from_current.hpp, fully isolating windows.h includes to cpptrace source files.

ctest passed locally on:

• msvc 19.50
• clang-cl 21.1.1

[ZeroMemes]

Converting to draft until the failing CI checks can be resolved

[jeremy-rifkin]

LGTM, thanks!

[jeremy-rifkin]

https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_pointers seems to indicate the definition comes from winnt.h but https://learn.microsoft.com/en-us/cpp/cpp/try-except-statement?view=msvc-170 indicates it comes from excpt.h, but if CI passes I'm happy to take that as a good sign excpt.h is correct

[ZeroMemes]

Yeah, apologies for not elaborating at all on that.

The actual definition of EXCEPTION_POINTERS is indeed in winnt.h, but since all that's needed is a pointer type, a forward declaration is sufficient. Like you pointed out, excpt.h is documented to provide a macro definition of GetExceptionInformation(), and the documentation for that macro indicates that it evaluates to PEXCEPTION_POINTERS. Any compliant implementation of the Win32 API should be compatible with these changes.

[jeremy-rifkin]

Perfect thanks! That gives me more confidence in the portability of this