Force retranslate Cython modules in "new_build_ext" if "-f" option is passed...

Force retranslate Cython modules in "new_build_ext" if "-f" option is passed to "build_ext" command.

Cython/Distutils/build_ext.py

@@ -18,7 +18,7 @@ class new_build_ext(_build_ext, object):
             nthreads = int(nthreads) if nthreads else None
             from Cython.Build.Dependencies import cythonize
             self.distribution.ext_modules[:] = cythonize(
-                self.distribution.ext_modules, nthreads=nthreads)
+                self.distribution.ext_modules, nthreads=nthreads, force=self.force)
         super(new_build_ext, self).finalize_options()
 
 # This will become new_build_ext in the future.