ci: Remove Windows NDK symlink; GH images now include space-less NDK

In [1] this hack was introduced because GH Actions virtual-environments
installed the SDK in `Program Files` which includes a space, but this is
not supported by the NDK. Now that the issue has been addressed [2] and
the images deployed this workaround can be removed again.

[1]: rust-mobile#92
[2]: actions/runner-images#2343

.github/workflows/rust.yml

@@ -77,23 +77,6 @@ jobs:
       run:
         cargo install --path cargo-apk
 
-    - if: runner.os == 'Windows'
-      name: Create symlink to Android SDK/NDK without spaces
-      run: |
-        $oldAndroidPath = $env:ANDROID_HOME
-        $sdk_root = "C:\Android"
-        New-Item -Path $sdk_root -ItemType SymbolicLink -Value $oldAndroidPath
-
-        echo "ANDROID_SDK_ROOT=$sdk_root" >> $env:GITHUB_ENV
-        echo "ANDROID_NDK_ROOT=$sdk_root\ndk-bundle" >> $env:GITHUB_ENV
-
-        # Update legacy path for ndk-build:
-        echo "ANDROID_HOME=$sdk_root" >> $env:GITHUB_ENV
-
-        # Unset legacy paths:
-        echo "ANDROID_NDK_HOME=" >> $env:GITHUB_ENV
-        echo "ANDROID_NDK_PATH=" >> $env:GITHUB_ENV
-
     - name: Cargo check for target ${{ matrix.rust-target }}
       run: cargo check -p ndk --target ${{ matrix.rust-target }} --all-features