[gnutls-devel] GnuTLS | fix mingw64 detection (!1476)

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Steve Lhomme created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1476

Project:Branches: robUx4/gnutls:mingw64-detection to gnutls/gnutls:master
Author:   Steve Lhomme




When building for mingw64 i686, `CertEnumCRLsInStore` is used via LoadLibrary, even though it's available in the toolchain.

The `#ifdef` in the original code was intended to only do it for old versions of `mingw32` and never for `mingw64`. But the check for `__MINGW64__` is incorrect as it only matches 64-bits versions of `mingw64`.

This patch uses `__MINGW64_VERSION_MAJOR` instead of `__MINGW64__`.

This was not a problem so far as `LoadLibrary` is available on regular Windows builds. But it's not available in UWP builds, system calls have to be linked directly, not called indirectly via `LoadLibrary`.

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