Remove mingw i686 from CI (#158)

Author: ginnyTheCat

.github/workflows/CI.yml

@@ -81,7 +81,6 @@ jobs:
         include:
           - { sys: ucrt64, env: ucrt-x86_64 }
           - { sys: mingw64, env: x86_64 }
-          - { sys: mingw32, env: i686 }
           - { sys: clang64, env: clang-x86_64 }
     steps:
       - uses: msys2/setup-msys2@v2
@@ -100,6 +99,7 @@ jobs:
       - run: rustc --version --verbose
       - run: cargo test --features serde
         env:
+          LIBCLANG_PATH: /${{matrix.sys}}/bin
           CARGO_TERM_COLOR: always
 
   asan: