master fails to build on macOS

[John Wiegley]

I'm seeing this after pulling just now:

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builder for '/nix/store/vwpdsg0sw2nwxr186jhxagvja436pm02-emacs-27.0.50.drv' 
failed with exit code 2; last 10 log lines:
  keyboard.c:5466:11: error: use of undeclared identifier 'used_mouse_menu'
        if (used_mouse_menu)
            ^
  keyboard.c:5467:10: error: use of undeclared identifier 'used_mouse_menu'
          *used_mouse_menu = true;
           ^
  2 errors generated.
  make[1]: *** [Makefile:381: keyboard.o] Error 1
  make[1]: Leaving directory 
'/private/tmp/nix-build-emacs-27.0.50.drv-0/master/src'
  make: *** [Makefile:418: src] Error 2
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-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2