Add import CoreFoundation to NSPlatform.swift

Author: MaxDesiatov

Sources/Foundation/NSPlatform.swift

@@ -21,6 +21,9 @@ fileprivate var _NSPageSize: Int {
 #elseif os(WASI)
 // WebAssembly defines a fixed page size
 fileprivate let _NSPageSize: Int = 65_536
+
+// Workaround for the lack of working Wasm autolinking in Swift 5.4
+import CoreFoundation
 #endif
 
 public func NSPageSize() -> Int {