bug#46036: fails do build on macos 10.7

[Riccardo Mottola]

Compilation of 27.1 yields:
nsfns.m:496:33: error: unexpected type name 'BOOL': expected expression
  NSNumber *isUbiquitousItem = @YES;
                                ^
/usr/include/objc/objc.h:50:26: note: expanded from macro 'YES'
#define YES             (BOOL)1
                         ^

this code is guarded with MacOS 10.7, but the compiler doesn't like it.

It is as easy to write it old-style:
  NSNumber *isUbiquitousItem = [NSNumber numberWithBool:YES];

and emacs 27.1 happily running on Lion again.

Thanks