Makefile: don't run sphinx in quiet mode

Rationale:

* Sometimes Sphinx is slow and it's nice to have progress indicators while it's
  running

* If there's a warning or error, it may be possible to get relevant context

Author: dmerejkowsky

Makefile

@@ -62,7 +62,7 @@ all: ensure_prerequisites
 	mkdir -p locales/$(LANGUAGE)/LC_MESSAGES/
 	$(CP_CMD) -u --parents *.po */*.po locales/$(LANGUAGE)/LC_MESSAGES/
 	$(MAKE) -C $(CPYTHON_PATH)/Doc/     \
-	  SPHINXOPTS='-qW -j$(JOBS)         \
+	  SPHINXOPTS='-W -j$(JOBS)         \
 	  -D locale_dirs=$(abspath locales) \
 	  -D language=$(LANGUAGE)           \
 	  -D gettext_compact=0           \