doc build: work-around for #11727 can be removed

This issue has been fixed. We can now show docbuild output even if the build fails.

doc/Makefile

@@ -35,13 +35,7 @@ cleanall: clean
 
 html: deps
 	@echo "Building HTML documentation."
-ifneq ($(OS),WINNT)
 	$(JULIA_EXECUTABLE) --color=yes $(call cygpath_w,$(SRCDIR)/make.jl) $(DOCUMENTER_OPTIONS)
-else
-# work around issue #11727, windows output redirection breaking on buildbot
-	$(JULIA_EXECUTABLE) --color=yes $(call cygpath_w,$(SRCDIR)/make.jl) $(DOCUMENTER_OPTIONS) > docbuild.log 2>&1
-	@cat docbuild.log
-endif
 	@echo "Build finished. The HTML pages are in _build/html."
 
 pdf: deps