buildRustPackage: Allow pname attribute

[marsam]

Motivation for this change

Since #49398 most of the package build helpers accept pname, but buildRustPackage was missing this feature

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[Mic92]

backport:
[detached HEAD 5f3be9b] buildRustPackage: Allow pname attribute
Author: Mario Rodas marsam@users.noreply.github.com
Date: Fri Mar 1 21:45:12 2019 -0500
1 file changed, 2 insertions(+), 1 deletion(-)