outputs/vmroot: use the build runtime shell

otherwise, this will use the cross runtime shell, which is wrong!

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

modules/outputs/vmroot.nix

@@ -63,7 +63,7 @@ in
           ln -s ${kernel.headers} build
           echo ${cmdline} > commandline
           cat > run.sh << EOF
-          #!${pkgs.runtimeShell}
+          #!${pkgs.pkgsBuildBuild.runtimeShell}
           ${pkgs.pkgsBuildBuild.run-liminix-vm}/bin/run-liminix-vm --command-line ${cmdline} --arch ${pkgs.stdenv.hostPlatform.qemuArch} --phram-address 0x${phram_address} \$* ${makeBootableImage} ${config.system.outputs.rootfs}
           EOF
           chmod +x run.sh