Turbine package: add m4 dependency (#10948)

m4 is a build and run dependency for Turbine: it is used at run time
to generate scheduler job files for the workflows.

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

@@ -40,6 +40,7 @@ class Turbine(AutotoolsPackage):
     depends_on('autoconf', type='build')
     depends_on('automake', type='build')
     depends_on('libtool', type='build')
+    depends_on('m4', type=('build', 'run'))
 
     def setup_environment(self, spack_env, run_env):
         spec = self.spec