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

Mads just added this compiler feature for Android in swiftlang/swift#84574, so
update the NDK version too, since that new feature requires NDK 28 or later.

Author: finagolfin

.github/workflows/pull_request.yml

@@ -25,6 +25,7 @@ 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_version: '["r28c"]'
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main

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 +76,13 @@ 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
       if let _backtrace {
         initializedCount = .init(clamping: _backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
       }