regress/mdoc/Em/noarg.out_lint

   1 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Em
   2 mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
   3 mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
   4 mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)