stop building mingw ; if someone wants to maintain this port please reach out !

.github/workflows/unittest_windows.yml

@@ -1,27 +0,0 @@
-name: windows
-on:
-  push:
-    paths-ignore:
-    - 'docs/**'
-  pull_request:
-
-jobs:
-  windows:
-    runs-on: windows-latest
-    steps:
-    - uses: actions/checkout@v1
-    - uses: seanmiddleditch/gha-setup-vsdevenv@master
-    - uses: seanmiddleditch/gha-setup-ninja@master
-    - run: |
-        mkdir build
-        cd build
-        cmake -GNinja -DCMAKE_CXX_COMPILER=cl.exe -DCMAKE_C_COMPILER=cl.exe -DUSE_WS=1 -DUSE_TEST=1 -DUSE_ZLIB=OFF -DBUILD_SHARED_LIBS=OFF ..
-    - run: |
-        cd build
-        ninja
-    - run: |
-        cd build
-        ninja test
-
-#- run: ../build/test/ixwebsocket_unittest.exe
-# working-directory: test