ci: stop testing mingw builds

Zig supports both Linux and Windows natively. Those are the main use
cases we are focusing on. Happy to accept mingw patches if they are
non-invasive, but we will not be hampering progress on the main use
cases with failing mingw CI builds.

ci/azure/pipelines.yml

@@ -28,17 +28,7 @@ jobs:
 - job: BuildWindows
   pool:
     vmImage: 'windows-2019'
-  strategy:
-    matrix:
-      mingw64:
-        CHERE_INVOKING: yes
-        MSYSTEM: MINGW64
-        SCRIPT: '%CD:~0,2%\msys64\usr\bin\bash -lc "bash ci/azure/windows_mingw_script"'
-      msvc:
-        SCRIPT: ci/azure/windows_msvc_script.bat
-
   timeoutInMinutes: 360
-
   steps:
   - powershell: |
       (New-Object Net.WebClient).DownloadFile("https://github.com/msys2/msys2-installer/releases/download/2020-09-03/msys2-base-x86_64-20200903.sfx.exe", "sfx.exe")
@@ -57,7 +47,7 @@ jobs:
   - task: DownloadSecureFile@1
     inputs:
       secureFile: s3cfg
-  - script: $(SCRIPT)
+  - script: ci/azure/windows_msvc_script.bat
     name: main
     displayName: 'Build and test'
 - job: OnMasterSuccess

ci/azure/windows_mingw_script

@@ -1,28 +0,0 @@
-#!/bin/sh
-
-set -x
-set -e
-
-pacman --noconfirm --needed -S git base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake mingw-w64-x86_64-clang mingw-w64-x86_64-lld mingw-w64-x86_64-llvm
-
-git config core.abbrev 9
-
-# Git is wrong for autocrlf being enabled by default on Windows.
-# git is mangling files on Windows by default.
-# This is the second bug I've tracked down to being caused by autocrlf.
-git config core.autocrlf false
-# Too late; the files are already mangled.
-git checkout .
-
-ZIGBUILDDIR="$(pwd)/build"
-PREFIX="$ZIGBUILDDIR/dist"
-CMAKEFLAGS="-DCMAKE_COLOR_MAKEFILE=OFF -DCMAKE_INSTALL_PREFIX=$PREFIX -DZIG_STATIC=ON"
-
-mkdir $ZIGBUILDDIR
-cd $ZIGBUILDDIR
-
-cmake .. -G 'MSYS Makefiles' -DCMAKE_BUILD_TYPE=RelWithDebInfo $CMAKEFLAGS -DCMAKE_EXE_LINKER_FLAGS='-fuse-ld=lld -Wl,/debug,/pdb:zig.pdb'
-
-make -j$(nproc) install
-
-./zig build test-behavior -Dskip-non-native -Dskip-release