try to fix launchpad build

this error:
cd debian/python-gevent-dbg/usr/lib/debug/usr/lib && mv pyshared pymodules
cd: 1: can't cd to debian/python-gevent-dbg/usr/lib/debug/usr/lib
make[1]: *** [override_dh_strip] Error

debian/rules

 #!/usr/bin/make -f
 %:
-	dh $@ --parallel
+	dh $@
 
 override_dh_auto_clean:
 	dh_auto_clean
@@ -10,12 +10,6 @@ override_dh_compress:
 	dh_compress -X.js -X_static/* -X _sources/* -X_sources/*/* -X.inv
 
 override_dh_strip:
-ifeq (,$(filter nostrip,$(DEB_BUILD_OPTIONS)))
 	dh_strip --dbg-package=python-gevent-dbg
-	cd debian/python-gevent-dbg/usr/lib/debug/usr/lib && mv pyshared pymodules
-endif
 
-override_dh_installdocs:
-	dh_installdocs --link-doc=python-gevent
-
-.PHONY: override_dh_auto_build override_dh_auto_clean override_dh_compress override_dh_strip override_dh_installdocs
+.PHONY: override_dh_auto_clean override_dh_compress override_dh_strip