minikube: set libvirt to PATH to avoid PROVIDER_KVM2_NOT_FOUND error

`minikube start --driver=kvm2` requires `virsh` command. Without it, the
following error is incurred:

  Exiting due to PROVIDER_KVM2_NOT_FOUND: The 'kvm2' provider was not
  found: exec: "virsh": executable file not found in $PATH

This commit adds libvirt to PATH to avoid this error.

pkgs/by-name/mi/minikube/package.nix

@@ -72,6 +72,7 @@ buildGoModule (finalAttrs: {
     installBin out/minikube
 
     wrapProgram $out/bin/minikube --set MINIKUBE_WANTUPDATENOTIFICATION false \
+      --prefix PATH : ${lib.makeBinPath (lib.optionals stdenv.hostPlatform.isLinux [ libvirt ])} \
       --prefix LD_LIBRARY_PATH : ${
         lib.makeLibraryPath (lib.optionals stdenv.hostPlatform.isLinux [ libvirt ])
       }