Merge bitcoin-core/secp256k1#1401: ci, gha: Run all MSVC tests on Windows natively

d78bec7001 ci: Remove Windows MSVC tasks from Cirrus CI (Hennadii Stepanov)
3545dc2b9b ci, gha: Run all MSVC tests on Windows natively (Hennadii Stepanov)

Pull request description:

ACKs for top commit:
  real-or-random:
    ACK d78bec7001
  jonasnick:
    ACK d78bec7001

Tree-SHA512: b58162a9f0827dceb1c7eb6fb7c759c0bffcf3e0d24cc7e6628ad71d1faaabaffb9d8de6fcd3d07bfcaca409632a13f711f9ad871a30718139557544cf91b4bf

.cirrus.yml

@@ -208,48 +208,6 @@ task:
     - ./ci/cirrus.sh
   << : *CAT_LOGS
 
-task:
-  << : *LINUX_CONTAINER
-  env:
-    WRAPPER_CMD: wine
-    WERROR_CFLAGS: -WX
-    WITH_VALGRIND: no
-    ECDH: yes
-    RECOVERY: yes
-    EXPERIMENTAL: yes
-    SCHNORRSIG: yes
-    ELLSWIFT: yes
-    CTIMETESTS: no
-    # Use a MinGW-w64 host to tell ./configure we're building for Windows.
-    # This will detect some MinGW-w64 tools but then make will need only
-    # the MSVC tools CC, AR and NM as specified below.
-    HOST: x86_64-w64-mingw32
-    CC: /opt/msvc/bin/x64/cl
-    AR: /opt/msvc/bin/x64/lib
-    NM: /opt/msvc/bin/x64/dumpbin -symbols -headers
-    # Set non-essential options that affect the CLI messages here.
-    # (They depend on the user's taste, so we don't want to set them automatically in configure.ac.)
-    CFLAGS: -nologo -diagnostics:caret
-    LDFLAGS: -Xlinker -Xlinker -Xlinker -nologo
-  matrix:
-    - name: "x86_64 (MSVC): Windows (Debian stable, Wine)"
-    - name: "x86_64 (MSVC): Windows (Debian stable, Wine, int128_struct)"
-      env:
-        WIDEMUL: int128_struct
-    - name: "x86_64 (MSVC): Windows (Debian stable, Wine, int128_struct with __(u)mulh)"
-      env:
-        WIDEMUL: int128_struct
-        CPPFLAGS: -DSECP256K1_MSVC_MULH_TEST_OVERRIDE
-    - name: "i686 (MSVC): Windows (Debian stable, Wine)"
-      env:
-        HOST: i686-w64-mingw32
-        CC: /opt/msvc/bin/x86/cl
-        AR: /opt/msvc/bin/x86/lib
-        NM: /opt/msvc/bin/x86/dumpbin -symbols -headers
-  test_script:
-    - ./ci/cirrus.sh
-  << : *CAT_LOGS
-
 # Sanitizers
 task:
   << : *LINUX_CONTAINER
@@ -343,4 +301,3 @@ task:
   test_script:
     - g++ -Werror include/*.h
     - clang -Werror -x c++-header include/*.h
-    - /opt/msvc/bin/x64/cl.exe -c -WX -TP include/*.h