mandoc: change OSNAME to Nixpkgs to match groff

See also

* https://github.com/NixOS/nixpkgs/pull/214307
* https://github.com/NixOS/nixpkgs/pull/213256

Changed files
+1 -1
pkgs
tools
misc
mandoc
+1 -1
pkgs/tools/misc/mandoc/default.nix
···
configureLocal = ''
MANPATH_DEFAULT="/run/current-system/sw/share/man"
MANPATH_BASE="$MANPATH_DEFAULT"
-
OSNAME="NixOS"
+
OSNAME="Nixpkgs"
PREFIX="$out"
LD_OHASH="-lutil"
# Use symlinks instead of hardlinks (more commonly used in nixpkgs)