Revert #230601: "gnu-efi: 3.0.15 -> 3.0.17"

This reverts commit 6efc3981aab2b94545beef6e17a467bedfe748cf.
https://github.com/NixOS/nixpkgs/pull/230601#issuecomment-1567081935
https://github.com/NixOS/nixpkgs/pull/234796#issuecomment-1574199486

pkgs/development/libraries/gnu-efi/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "gnu-efi";
-  version = "3.0.17";
+  version = "3.0.15";
 
   src = fetchurl {
     url = "mirror://sourceforge/gnu-efi/${pname}-${version}.tar.bz2";
-    sha256 = "sha256-eAfpAzSTQ6ehQuu5NHA6KHIjXolojPWGwDKwoQh7yvQ=";
+    sha256 = "sha256-kxole5xcG6Zf9Rnxg3PEOKJoJfLbeGaxY+ltGxaPIOo=";
   };
 
   patches = [