Exclude PrivacyInfo.xcprivacy resource on Android

[colemancda]

Summary

• Declaring resources: [.copy("PrivacyInfo.xcprivacy")] on the SQLite target makes SwiftPM auto-generate a resource_bundle_accessor.swift file with Bundle.module, which unconditionally imports Foundation and calls Bundle.main/Bundle(path:).
• On the Android Swift SDK, that pulls in libFoundation.so — and, since it has its own unconditional dependency on libFoundationInternationalization.so + ICU there, all three — for consumers who otherwise only need FoundationEssentials.
• PrivacyInfo.xcprivacy only has meaning for the Apple App Store, so this excludes it from the target's resources when a TARGET_OS_ANDROID environment variable is set, following the same convention swift-android-native uses to detect an Android cross-compile — Package.swift always evaluates on the host, so it has no direct way to see the actual build destination.
• No effect on existing consumers: the variable is unset by default, so PrivacyInfo.xcprivacy continues to ship exactly as before everywhere else.

Test plan

• swift package dump-package — without the env var, resources still includes PrivacyInfo.xcprivacy
• TARGET_OS_ANDROID=1 swift package dump-package — resources is empty and PrivacyInfo.xcprivacy moves to exclude
• Cross-compiled a downstream Android app against this branch and confirmed via readelf -d/nm that Bundle.main/Bundle(path:) no longer appear as undefined symbols