Win32 Python puts these in /Scripts instead of /bin

I have some colorful language for whoever decided that was a good idea...

doc/Makefile

@@ -15,8 +15,10 @@ ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 
 JULIA_ENV     = $(JULIAHOME)/deps/julia-env
-ACTIVATE      = $(JULIA_ENV)/bin/activate
-SPHINX_BUILD  = $(JULIA_ENV)/bin/sphinx-build
+# Win32 Python uses /Scripts instead of /bin
+JULIA_ENV_BIN = $(shell if [ -e $(JULIA_ENV)/Scripts ]; then echo $(JULIA_ENV)/Scripts; else echo $(JULIA_ENV)/bin; fi)
+ACTIVATE      = $(JULIA_ENV_BIN)/activate
+SPHINX_BUILD  = $(JULIA_ENV_BIN)/sphinx-build
 
 $(ACTIVATE):
 	$(MAKE) -C $(JULIAHOME)/deps install-virtualenv