Use the new #available(Android <API>, *) instead from Swift 6.3 to look for backtrace()

Mads added this compiler feature for Android in swiftlang/swift#84574 before the
6.3 branch, so update the Android triples and NDK version to test it, as it requires
NDK 28 or later.

Author: finagolfin

.github/workflows/pull_request.yml

@@ -25,6 +25,8 @@ jobs:
       ios_host_exclude_xcode_versions: '[{"xcode_version": "16.2"}, {"xcode_version": "16.3"}, {"xcode_version": "16.4"}]'
       enable_wasm_sdk_build: true
       enable_android_sdk_build: true
+      android_ndk_versions: '["r28c"]'
+      android_sdk_triples: '["aarch64-unknown-linux-android33", "x86_64-unknown-linux-android28"]'
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/[email protected]

Sources/Testing/SourceAttribution/Backtrace.swift

@@ -40,7 +40,7 @@ public struct Backtrace: Sendable {
     self.addresses = addresses.map { Address(UInt(bitPattern: $0)) }
   }
 
-#if os(Android) && !SWT_NO_DYNAMIC_LINKING
+#if compiler(<6.3) && os(Android)
   /// The `backtrace()` function.
   ///
   /// This function was added to Android with API level 33, which is higher than
@@ -76,7 +76,16 @@ public struct Backtrace: Sendable {
         initializedCount = .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
       }
 #elseif os(Android)
-#if !SWT_NO_DYNAMIC_LINKING
+#if compiler(>=6.3)
+      if #available(Android 33, *) {
+        initializedCount = addresses.withMemoryRebound(to: UnsafeMutableRawPointer.self) { addresses in
+          .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
+        }
+      }
+      else {
+        print("Backtraces are unavailable on Android API 32 and older.")
+      }
+#else
       if let _backtrace {
         initializedCount = .init(clamping: _backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
       }