re-add iov in file so PipeReader compile

src/io/source.zig

@@ -13,6 +13,7 @@ pub const Source = union(enum) {
     const Tty = uv.uv_tty_t;
     const File = struct {
         fs: uv.fs_t,
+        iov: uv.uv_buf_t,
         file: uv.uv_file,
     };
 
@@ -79,22 +80,6 @@ pub const Source = union(enum) {
         }
     }
 
-    pub fn isClosed(this: Source) bool {
-        switch (this) {
-            .pipe => |pipe| return pipe.isClosed(),
-            .tty => |tty| return tty.isClosed(),
-            .file => |file| return file.file == -1,
-        }
-    }
-
-    pub fn isActive(this: Source) bool {
-        switch (this) {
-            .pipe => |pipe| return pipe.isActive(),
-            .tty => |tty| return tty.isActive(),
-            .file => return false,
-        }
-    }
-
     pub fn openPipe(loop: *uv.Loop, fd: bun.FileDescriptor, ipc: bool) bun.JSC.Maybe(*Source.Pipe) {
         log("openPipe (fd = {})", .{fd});
         const pipe = bun.default_allocator.create(Source.Pipe) catch bun.outOfMemory();