x11-wm/river: unbreak build after 5d998836b36f

./river/c.zig:18:20: error: C import failed
pub usingnamespace @cImport({

^

./zig-cache/o/daef1847f9aadef85fa78182104dcc98/cimport.h:4:10: note: 'linux/input-event-codes.h' file not found

^

./river/Cursor.zig:173:14: error: container 'c' has no member called 'setenv'

if (c.setenv("XCURSOR_SIZE", size_str, 1) < 0) return error.OutOfMemory;
     ^

./river/Cursor.zig:124:5: note: referenced here

try self.setTheme(null, null);
^

./river/Seat.zig:105:5: note: referenced here

try self.cursor.init(self);
^

./river/InputManager.zig:131:5: note: referenced here

try seat_node.data.init(default_seat_name);
^

./river/Server.zig:121:5: note: referenced here

try self.input_manager.init();
^

./river/main.zig:97:5: note: referenced here

try server.init();
^

./river/InputConfig.zig:291:11: error: container 'c' has no member called 'libinput_device'

*c.libinput_device,
  ^

./river/command/input.zig:200:22: error: container 'c' has no member called 'libevdev_event_code_from_name'

const ret = c.libevdev_event_code_from_name(c.EV_KEY, args[3]);
             ^

./river/command/input.zig:116:30: error: container 'c' has no member called 'libevdev_event_code_get_name'

mem.sliceTo(c.libevdev_event_code_get_name(c.EV_KEY, scroll_button.button), 0),
             ^

./river/command/map.zig:158:25: error: container 'c' has no member called 'libevdev_event_code_from_name'

const event_code = c.libevdev_event_code_from_name(c.EV_KEY, name);
                    ^

./river/command/map.zig:85:24: note: referenced here

const event_code = try parseEventCode(allocator, args[3], out);
                   ^

./river/command/spawn.zig:44:14: error: container 'c' has no member called 'setsid'

if (c.setsid() < 0) unreachable;
     ^

Pointy hat to: manu