postgresqlPackages.{plperl,plpython3,pltcl}: set pname and version instead of name (#486387)

pkgs/servers/sql/postgresql/ext/plperl.nix

@@ -11,7 +11,8 @@ let
     let
       perl' = perl.withPackages f;
       finalPackage = buildEnv {
-        name = "${postgresql.pname}-plperl-${postgresql.version}";
+        pname = "${postgresql.pname}-plperl";
+        inherit (postgresql) version;
         paths = [ postgresql.plperl ];
         passthru = {
           inherit withPackages;

pkgs/servers/sql/postgresql/ext/plpython3.nix

@@ -11,7 +11,8 @@ let
     let
       python = python3.withPackages f;
       finalPackage = buildEnv {
-        name = "${postgresql.pname}-plpython3-${postgresql.version}";
+        pname = "${postgresql.pname}-plpython3";
+        inherit (postgresql) version;
         paths = [ postgresql.plpython3 ];
         passthru = {
           inherit withPackages;

pkgs/servers/sql/postgresql/ext/pltcl.nix

@@ -13,7 +13,8 @@ let
       pkgs = f tclPackages;
       paths = lib.concatMapStringsSep " " (pkg: "${pkg}/lib") pkgs;
       finalPackage = buildEnv {
-        name = "${postgresql.pname}-pltcl-${postgresql.version}";
+        pname = "${postgresql.pname}-pltcl";
+        inherit (postgresql) version;
         paths = [ postgresql.pltcl ];
         passthru = {
           inherit withPackages;