unmark dynamically-linked jemalloc builds as broken

It turns out that this was actually fixed by
bec507d739 and
857ac42aac, but we didn't identify it at the
time. Notably, the `dynamic` devshell is still broken.

nix/pkgs/main/default.nix

@@ -190,11 +190,4 @@ craneLib.buildPackage ( commonAttrs // {
   };
 
   meta.mainProgram = commonAttrs.pname;
-  # Dynamically-linked jemalloc is broken on linux due to link-order problems,
-  # where the symbols are being resolved to libc malloc/free before jemalloc is
-  # loaded. This problem does not occur on darwin for unknown reasons.
-  meta.broken =
-    stdenv.isLinux &&
-    !stdenv.hostPlatform.isStatic &&
-    (featureEnabled "jemalloc");
 })