Improve kernel32 compatibility for MSVC tools

[marijnvdwerf]

Summary

This improves Wibo's kernel32 compatibility for legacy MSVC-era tooling. The changes were found while forcing a full LEGOLAND decompilation build through Wibo, including compile, link, and cvdump/reccmp.

The branch adds or fixes:

• lstrcpynA export and truncation/null-termination behavior.
• GetTempPathA trailing-backslash and required-buffer behavior.
• GetTempFileNameA prefix, fixed-unique, generated-unique, and empty-file creation behavior.
• GetProcAddress missing-export handling so dynamic probes return NULL/ERROR_PROC_NOT_FOUND instead of routing to Wibo's missing-import trap.
• Default activation-context DLL redirections for VC8 runtime DLL names, plus the redirection record size fix.
• CreateFileMappingA file-backed mapping growth for writable protections, and correct zero-length file mapping failures.
• MapViewOfFile / MapViewOfFileEx handling of FILE_MAP_ALL_ACCESS as shared read/write access instead of copy-on-write.
• GetModuleHandleExW with name, NULL, FROM_ADDRESS, PIN, and UNCHANGED_REFCOUNT cases.

Fixture tests are included for the new and changed behavior.

Microsoft Learn references

• lstrcpynA: iMaxLength includes space for the terminating null character, and success returns the destination buffer.
• GetTempPathA: successful paths end with a backslash and the too-small-buffer return value is the required length.
• GetTempFileNameA: only the first three prefix characters are used; uUnique == 0 creates and closes an empty file, while nonzero uUnique only generates the name.
• GetProcAddress: missing names/ordinals fail with NULL and extended error information.
• Activation Contexts and side-by-side assemblies as a resource: activation contexts carry DLL redirection information used by the loader and manifests can provide process-default/static-import side-by-side bindings.
• CreateFileMappingA: writable file mappings larger than the backing file extend the file; zero-sized file mappings have documented failure behavior.
• MapViewOfFile and file-mapping access rights: FILE_MAP_ALL_ACCESS is equivalent to FILE_MAP_WRITE for mapping views, while FILE_MAP_COPY creates a private copy-on-write view whose changes are not written back.
• GetModuleHandleExW: supports loaded-module lookup by name, process module lookup with NULL, address-based lookup, and the documented refcount flags.

Validation

• Built locally with cmake --preset debug-macos and cmake --build --preset debug-macos.
• Ran the new Wibo binary through a full LEGOLAND compile + link using MSVC6 tools under Wibo.
• Ran LEGOLAND tools/verify / reccmp through Wibo successfully.
• Fork CI passed: https://github.com/marijnvdwerf/wibo/actions/runs/27059227930