Remove workaround for bug triggered by Android environment variable

We had to unset this common Android env var to work around the compiler bug, but it
should be fixed in the compiler now.

Author: finagolfin

.github/workflows/scripts/install-and-build-with-sdk.sh

@@ -797,11 +797,6 @@ build() {
 
             log "Running: $build_command"
 
-            # clear the ANDROID_NDK_ROOT environment variable if it is set
-            # due to https://github.com/swiftlang/swift-driver/pull/1879
-            # otherwise build error: missing required module 'SwiftAndroid'
-            export ANDROID_NDK_ROOT=""
-
             if eval "$build_command"; then
                 log "✅ Swift build with Android Swift SDK completed successfully"
             else