pybind11: test functionality (#8304)

* pybind11: test support

Add a test functionality to pybind11.

* CMake: test also on "make check"

Some projects use non-CTest manual targets for tests.

lib/spack/spack/build_systems/cmake.py

@@ -256,8 +256,10 @@ def check(self):
         with working_dir(self.build_directory):
             if self.generator == 'Unix Makefiles':
                 self._if_make_target_execute('test')
+                self._if_make_target_execute('check')
             elif self.generator == 'Ninja':
                 self._if_ninja_target_execute('test')
+                self._if_ninja_target_execute('check')
 
     # Check that self.prefix is there after installation
     run_after('install')(PackageBase.sanity_check_prefix)