tweaks to build process to support py2exe

py2exe is unable to handle .eggs which are packaged as zip files
in preference it will pull in other versions of libraries if they 
can be found in the environment.

this changes causes .eggs to be built as .egg directories, which
py2exe can handle.

Makefile

@@ -50,8 +50,7 @@ build-auto-deps: check-deps
 	echo PYTHONPATH="$(PYTHONPATH)$(PATHSEP)$(SUPPORTLIB)$(PATHSEP)" $(PYTHON) misc/dependencies/build-deps-setup.py install --prefix="$(SUPPORT)"
 	@-PYTHONPATH="$(PYTHONPATH)$(PATHSEP)$(SUPPORTLIB)$(PATHSEP)" \
          $(PYTHON) misc/dependencies/build-deps-setup.py install \
-	 --prefix="$(SUPPORT)" || \
-	echo "Build of Tahoe's bundled, automatically built dependent libraries failed -- please see docs/install.html for instructions."
+	 --prefix="$(SUPPORT)"
 
 # The following target is here because I don't know how to tell the buildmaster
 # to start instructing his slaves to "build-auto-deps" instead of instructing