treewide: add mainProgram attribute to lisp compilers

pkgs/development/compilers/ccl/default.nix

@@ -83,12 +83,13 @@ in stdenv.mkDerivation rec {
   hardeningDisable = [ "format" ];
 
   meta = with lib; {
-    description = "Clozure Common Lisp";
-    homepage    = "https://ccl.clozure.com/";
-    maintainers = lib.teams.lisp.members;
-    platforms   = attrNames options;
     # assembler failures during build, x86_64-darwin broken since 2020-10-14
     broken      = (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isx86_64);
+    description = "Clozure Common Lisp";
+    homepage    = "https://ccl.clozure.com/";
     license     = licenses.asl20;
+    mainProgram = "ccl";
+    maintainers = lib.teams.lisp.members;
+    platforms   = attrNames options;
   };
 }

pkgs/development/compilers/cmucl/binary.nix

@@ -48,14 +48,15 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   meta = with lib; {
-    homepage = "http://www.cons.org/cmucl/";
     description = "CMU implementation of Common Lisp";
+    homepage = "http://www.cons.org/cmucl/";
+    license = licenses.publicDomain;
     longDescription = ''
       CMUCL is a free implementation of the Common Lisp programming language
       which runs on most major Unix platforms.  It mainly conforms to the
       ANSI Common Lisp standard.
     '';
-    license = licenses.publicDomain;
+    mainProgram = "lisp";
     maintainers = lib.teams.lisp.members;
     platforms = [ "i686-linux" "x86_64-linux" ];
   };

pkgs/development/compilers/mkcl/default.nix

@@ -61,7 +61,8 @@ stdenv.mkDerivation rec {
     description = "ANSI Common Lisp Implementation";
     homepage = "https://common-lisp.net/project/mkcl/";
     license = licenses.lgpl2Plus;
-    platforms = platforms.linux;
+    mainProgram = "mkcl";
     maintainers = lib.teams.lisp.members;
+    platforms = platforms.linux;
   };
 }