Use the new #available(Android API, *) instead to look for backtrace()

Mads just added this compiler feature for Android in swiftlang/swift#84574

Author: finagolfin

Sources/Testing/SourceAttribution/Backtrace.swift

@@ -40,16 +40,6 @@ public struct Backtrace: Sendable {
     self.addresses = addresses.map { Address(UInt(bitPattern: $0)) }
   }
 
-#if os(Android) && !SWT_NO_DYNAMIC_LINKING
-  /// The `backtrace()` function.
-  ///
-  /// This function was added to Android with API level 33, which is higher than
-  /// our minimum deployment target, so we look it up dynamically at runtime.
-  private static let _backtrace = symbol(named: "backtrace").map {
-    castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<UnsafeMutableRawPointer?>, CInt) -> CInt).self)
-  }
-#endif
-
   /// Get the current backtrace.
   ///
   /// - Parameters:
@@ -77,8 +67,10 @@ public struct Backtrace: Sendable {
       }
 #elseif os(Android)
 #if !SWT_NO_DYNAMIC_LINKING
-      if let _backtrace {
-        initializedCount = .init(clamping: _backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
+      if #available(Android 33, *) {
+        initializedCount = addresses.withMemoryRebound(to: UnsafeMutableRawPointer.self) { addresses in
+          .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
+        }
       }
 #endif
 #elseif os(Linux) || os(FreeBSD) || os(OpenBSD)