buildPgxExtension: remove old versions

pgx had been renamed to pgrx in April 2023 already [1]. Newer versions
are already in nixpkgs as pgrx. Since the previous commit removed
the only remaining instance of a package still depending on
pgx 0.6.1, we can now remove all of buildPgxExtension and cargo-pgx.

[1]: pgcentralfoundation/pgrx#1106

pkgs/servers/sql/postgresql/generic.nix

@@ -24,7 +24,6 @@ let
       # JIT
       , jitSupport
       , nukeReferences, patchelf, llvmPackages
-      , makeRustPlatform, buildPgxExtension, cargo, rustc
 
       # PL/Python
       , pythonSupport ? false
@@ -235,13 +234,6 @@ let
           inherit (llvmPackages) llvm;
           postgresql = this;
           stdenv = stdenv';
-          buildPgxExtension = buildPgxExtension.override {
-            stdenv = stdenv';
-            rustPlatform = makeRustPlatform {
-              stdenv = stdenv';
-              inherit rustc cargo;
-            };
-          };
         };
         newSelf = self // scope;
         newSuper = { callPackage = newScope (scope // this.pkgs); };

pkgs/top-level/all-packages.nix

@@ -16757,19 +16757,6 @@ with pkgs;
   cargo-outdated = callPackage ../development/tools/rust/cargo-outdated {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation CoreServices Security SystemConfiguration;
   };
-  cargo-pgx_0_6_1 = callPackage ../development/tools/rust/cargo-pgx/0_6_1.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx_0_7_1 = callPackage ../development/tools/rust/cargo-pgx/0_7_1.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx_0_7_4 = callPackage ../development/tools/rust/cargo-pgx/0_7_4.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx = cargo-pgx_0_7_4;
-  buildPgxExtension = callPackage ../development/tools/rust/cargo-pgx/buildPgxExtension.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
   inherit (callPackages ../development/tools/rust/cargo-pgrx { })
     cargo-pgrx_0_10_2
     cargo-pgrx_0_11_2