calculate make_jobs in ninja (#32384)

This is in case ninja's setup_dependent_package is called before its
module is initialized by build_environment

var/spack/repos/builtin/packages/ninja/package.py

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 import sys
 
-from spack.build_environment import MakeExecutable
+from spack.build_environment import MakeExecutable, determine_number_of_jobs
 from spack.package import *
 from spack.util.executable import which_string
 
@@ -74,6 +74,8 @@ def install(self, spec, prefix):
 
     def setup_dependent_package(self, module, dspec):
         name = "ninja"
+
         module.ninja = MakeExecutable(
-            which_string(name, path=[self.spec.prefix.bin], required=True), module.make_jobs
+            which_string(name, path=[self.spec.prefix.bin], required=True),
+            determine_number_of_jobs(parallel=self.parallel),
         )