ci: try to use a fresh MSYS2

Author: Berrysoft

.github/workflows/libloading.yml

@@ -44,10 +44,10 @@ jobs:
           - i686-pc-windows-gnu
         include:
           - rust_target: x86_64-pc-windows-gnu
-            mingw_path: C:/msys64/mingw64/bin
+            mingw_path: C:/M/mingw64/bin
             package: mingw-w64-x86_64-gcc
           - rust_target: i686-pc-windows-gnu
-            mingw_path: C:/msys64/mingw32/bin
+            mingw_path: C:/M/mingw32/bin
             package: mingw-w64-i686-gcc
     steps:
       - uses: actions/checkout@v2
@@ -56,13 +56,13 @@ jobs:
       - run: rustup target add ${{ matrix.rust_target }}
       - uses: msys2/setup-msys2@v2
         with:
-          release: false
           install: ${{ matrix.package }}
+          update: true
+          location: C:/M
       - run: echo "${{ matrix.mingw_path }}" | Out-File -FilePath $env:GITHUB_PATH -Append
-        if: ${{ matrix.mingw_path }}"
       - run: cargo test --target ${{ matrix.rust_target }}
         env:
-          TARGET: ${{ matrix.rust_target}}
+          TARGET: ${{ matrix.rust_target }}
 
   msys2-test:
     runs-on: windows-latest