Fix: make-mode will work with sphinx-build command that is generated from setup.py entry_points definition.

This fix relates to https://bitbucket.org/birkenfeld/sphinx/pull-request/203/add-make-mode-to-sphinx-build-invoked-by/diff#comment-1133945

sphinx-build.py

@@ -11,8 +11,5 @@
 import sys
 
 if __name__ == '__main__':
-    from sphinx import main, make_main
-    if sys.argv[1:2] == ['-M']:
-        sys.exit(make_main(sys.argv))
-    else:
-        sys.exit(main(sys.argv))
+    from sphinx import main
+    sys.exit(main(sys.argv))

sphinx/__init__.py

@@ -41,6 +41,13 @@ if '+' in __version__ or 'pre' in __version__:
 
 
 def main(argv=sys.argv):
+    if sys.argv[1:2] == ['-M']:
+        sys.exit(make_main(argv))
+    else:
+        sys.exit(build_main(argv))
+
+
+def build_main(argv=sys.argv):
     """Sphinx build "main" command-line entry."""
     if sys.version_info[:3] < (2, 5, 0):
         sys.stderr.write('Error: Sphinx requires at least Python 2.5 to run.\n')