rocmPackages.hiprt: disable kernel encryption support

Per upstream encryption of kernels was a holdover from when hiprt was closed source.
Let's disable it and drop the need to rebuild easy-encryption.

https://github.com/GPUOpen-LibrariesAndSDKs/HIPRT/issues/11#issuecomment-2105410458

pkgs/development/rocm-modules/6/hiprt/default.nix

···
   fetchFromGitHub,
   cmake,
   clr,
-  gcc,
   python3,
 }:
 
···
   };
 
   postPatch = ''
-    g++ contrib/easy-encryption/cl.cpp -o contrib/easy-encryption/bin/linux/ee64 #replacing prebuilt binary
+    rm -rf contrib/easy-encrypt # contains prebuilt easy-encrypt binaries, we disable encryption
     substituteInPlace contrib/Orochi/contrib/hipew/src/hipew.cpp --replace-fail '"/opt/rocm/hip/lib/' '"${clr}/lib'
     substituteInPlace hiprt/hiprt_libpath.h --replace-fail '"/opt/rocm/hip/lib/' '"${clr}/lib/'
   '';
 
   nativeBuildInputs = [
-    gcc # required for replacing easy-encryption binary
     cmake
     python3
   ];
···
     (lib.cmakeBool "PRECOMPILE" true)
     # needs accelerator
     (lib.cmakeBool "NO_UNITTEST" true)
+    # we have no need to support baking encrypted kernels into object files
+    (lib.cmakeBool "NO_ENCRYPT" true)
     (lib.cmakeBool "FORCE_DISABLE_CUDA" true)
   ];