Fix MinGW ci (#371)

.github/workflows/msys2-build.yml

@@ -53,9 +53,13 @@ jobs:
 
     # Install xmake
     - name: Setup xmake
-      uses: xmake-io/github-action-setup-xmake@v1
-      with:
-        xmake-version: branch@dev
+      run: |
+        git clone https://github.com/xmake-io/xmake.git --recurse-submodules -b dev xmake_git
+        cd xmake_git
+        make build
+        make install PREFIX=/${{ matrix.msystem }}
+        xmake --version
+        cd ..
 
     # Update xmake repository (in order to have the file that will be cached)
     - name: Update xmake repository
@@ -79,7 +83,7 @@ jobs:
 
     # Build the engine
     - name: Build Nazara
-      run: xmake -v
+      run: xmake
 
     # Run unit tests
     - name: Run unit tests
@@ -94,4 +98,4 @@ jobs:
     - uses: actions/upload-artifact@v2
       with:
         name: ${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.mode }}
-        path: package
+        path: package