jemalloc450: drop package

The package was introduced in https://github.com/NixOS/nixpkgs/pull/38995
to fix rocksdb, but rocksdb is not using jemalloc450 anymore.

pkgs/development/libraries/jemalloc/common.nix

@@ -1,59 +0,0 @@
-{ version, sha256 }:
-{ lib, stdenv, fetchurl
-, fetchpatch
-# By default, jemalloc puts a je_ prefix onto all its symbols on OSX, which
-# then stops downstream builds (mariadb in particular) from detecting it. This
-# option should remove the prefix and give us a working jemalloc.
-# Causes segfaults with some software (ex. rustc), but defaults to true for backward
-# compatibility.
-, stripPrefix ? stdenv.hostPlatform.isDarwin
-, disableInitExecTls ? false
-}:
-
-with lib;
-
-stdenv.mkDerivation rec {
-  pname = "jemalloc";
-  inherit version;
-
-  src = fetchurl {
-    url = "https://github.com/jemalloc/jemalloc/releases/download/${version}/${pname}-${version}.tar.bz2";
-    inherit sha256;
-  };
-
-  patches = [
-    # workaround https://github.com/jemalloc/jemalloc/issues/2091
-    (fetchpatch {
-      url = "https://github.com/jemalloc/jemalloc/commit/3b4a03b92b2e415415a08f0150fdb9eeb659cd52.diff";
-      sha256 = "sha256-6AYtADREhfj93ZLk9xnXtjc6vHDU0EKLLOvLd6YdJeI=";
-    })
-  ];
-
-  # see the comment on stripPrefix
-  configureFlags = []
-    ++ optional stripPrefix "--with-jemalloc-prefix="
-    ++ optional disableInitExecTls "--disable-initial-exec-tls"
-    # jemalloc is unable to correctly detect transparent hugepage support on
-    # ARM (https://github.com/jemalloc/jemalloc/issues/526), and the default
-    # kernel ARMv6/7 kernel does not enable it, so we explicitly disable support
-    ++ optionals (stdenv.isAarch32 && versionOlder version "5") [
-      "--disable-thp"
-      "je_cv_thp=no"
-    ]
-  ;
-
-  doCheck = true;
-
-  enableParallelBuilding = true;
-
-  meta = with lib; {
-    homepage = "http://jemalloc.net";
-    description = "General purpose malloc(3) implementation";
-    longDescription = ''
-      malloc(3)-compatible memory allocator that emphasizes fragmentation
-      avoidance and scalable concurrency support.
-    '';
-    license = licenses.bsd2;
-    platforms = platforms.all;
-  };
-}

pkgs/development/libraries/jemalloc/default.nix

@@ -1,4 +1,58 @@
-import ./common.nix {
+{ lib
+, stdenv
+, fetchurl
+, fetchpatch
+# By default, jemalloc puts a je_ prefix onto all its symbols on OSX, which
+# then stops downstream builds (mariadb in particular) from detecting it. This
+# option should remove the prefix and give us a working jemalloc.
+# Causes segfaults with some software (ex. rustc), but defaults to true for backward
+# compatibility.
+, stripPrefix ? stdenv.hostPlatform.isDarwin
+, disableInitExecTls ? false
+}:
+
+stdenv.mkDerivation rec {
+  pname = "jemalloc";
   version = "5.2.1";
-  sha256 = "1xl7z0vwbn5iycg7amka9jd6hxd8nmfk7nahi4p9w2bnw9f0wcrl";
+
+  src = fetchurl {
+    url = "https://github.com/jemalloc/jemalloc/releases/download/${version}/${pname}-${version}.tar.bz2";
+    sha256 = "1xl7z0vwbn5iycg7amka9jd6hxd8nmfk7nahi4p9w2bnw9f0wcrl";
+  };
+
+  patches = [
+    # workaround https://github.com/jemalloc/jemalloc/issues/2091
+    (fetchpatch {
+      url = "https://github.com/jemalloc/jemalloc/commit/3b4a03b92b2e415415a08f0150fdb9eeb659cd52.diff";
+      sha256 = "sha256-6AYtADREhfj93ZLk9xnXtjc6vHDU0EKLLOvLd6YdJeI=";
+    })
+  ];
+
+  # see the comment on stripPrefix
+  configureFlags = []
+    ++ lib.optional stripPrefix "--with-jemalloc-prefix="
+    ++ lib.optional disableInitExecTls "--disable-initial-exec-tls"
+    # jemalloc is unable to correctly detect transparent hugepage support on
+    # ARM (https://github.com/jemalloc/jemalloc/issues/526), and the default
+    # kernel ARMv6/7 kernel does not enable it, so we explicitly disable support
+    ++ lib.optionals (stdenv.isAarch32 && lib.versionOlder version "5") [
+      "--disable-thp"
+      "je_cv_thp=no"
+    ]
+  ;
+
+  doCheck = true;
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    homepage = "http://jemalloc.net";
+    description = "General purpose malloc(3) implementation";
+    longDescription = ''
+      malloc(3)-compatible memory allocator that emphasizes fragmentation
+      avoidance and scalable concurrency support.
+    '';
+    license = licenses.bsd2;
+    platforms = platforms.all;
+  };
 }

pkgs/development/libraries/jemalloc/jemalloc450.nix

@@ -1,4 +0,0 @@
-import ./common.nix {
-  version = "4.5.0";
-  sha256 = "10373xhpc10pgmai9fkc1z0rs029qlcb3c0qfnvkbwdlcibdh2cl";
-}

pkgs/top-level/all-packages.nix

@@ -17294,8 +17294,6 @@ with pkgs;
     stdenv = if stdenv.cc.isClang then llvmPackages_10.stdenv else stdenv;
   };
 
-  jemalloc450 = callPackage ../development/libraries/jemalloc/jemalloc450.nix { };
-
   jose = callPackage ../development/libraries/jose { };
 
   jshon = callPackage ../development/tools/parsing/jshon { };