Fix src/Surface.zig

Change fastmem.copy to use memcpy builtin

build.zig.zon

@@ -9,7 +9,7 @@
             .hash = "1220be2c7b3f3a07b9150720140c7038f454a9ce0cbc5d303767c1e4a50856ec1b01",
         },
         .mach_glfw = .{
-            .url = "git+https://github.com/der-teufel-programming/mach-glfw#577220552e1b31c4496d2e0df2fb5fbc9287b966",
+            .url = "https://github.com/der-teufel-programming/mach-glfw/archive/577220552e1b31c4496d2e0df2fb5fbc9287b966.tar.gz",
             .hash = "12204779ba2f14b46f569110f774d5c3f48b7a105b6717e668bc410710bceae62072",
         },
         .zig_objc = .{

src/Surface.zig

@@ -2483,7 +2483,7 @@ pub fn performBindingAction(self: *Surface, action: input.Binding.Action) !bool
         .text => |data| {
             // For text we always allocate just because its easier to
             // handle all cases that way.
-            var buf = try self.alloc.alloc(u8, data.len);
+            const buf = try self.alloc.alloc(u8, data.len);
             defer self.alloc.free(buf);
             const text = configpkg.string.parse(buf, data) catch |err| {
                 log.warn(

src/fastmem.zig

@@ -18,7 +18,7 @@ pub inline fn copy(comptime T: type, dest: []T, source: []const T) void {
     if (builtin.link_libc) {
         _ = memcpy(dest.ptr, source.ptr, source.len * @sizeOf(T));
     } else {
-        std.mem.copyForwards(T, dest, source);
+        @memcpy(dest[0..source.len], source);
     }
 }