[wasm] Make Data.write(to:options:) API surface available on WASI

But its implementation will throw an error if called.

Sources/Foundation/Data.swift

@@ -2314,13 +2314,15 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
     }
 #endif
 
-#if !os(WASI)
     /// Write the contents of the `Data` to a location.
     ///
     /// - parameter url: The location to write the data into.
     /// - parameter options: Options for writing the data. Default value is `[]`.
     /// - throws: An error in the Cocoa domain, if there is an error writing to the `URL`.
     public func write(to url: URL, options: Data.WritingOptions = []) throws {
+#if os(WASI)
+        throw NSError(domain: NSPOSIXErrorDomain, code: Int(ENOTSUP), userInfo: nil)
+#else
         // this should not be marked as inline since in objc contexts we correct atomicity via _shouldUseNonAtomicWriteReimplementation
         try _representation.withInteriorPointerReference {
 #if DEPLOYMENT_RUNTIME_SWIFT
@@ -2334,8 +2336,8 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
             }
 #endif
         }
-    }
 #endif
+    }
 
     // MARK: -