gperf: add mainProgram

+1
+1
pkgs/development/tools/misc/gperf/default.nix
··· 37 38 homepage = "https://www.gnu.org/software/gperf/"; 39 platforms = lib.platforms.unix; 40 }; 41 }
··· 37 38 homepage = "https://www.gnu.org/software/gperf/"; 39 platforms = lib.platforms.unix; 40 + mainProgram = "gperf"; 41 }; 42 }