pythongh-127356: Fix prepend doctrees directory for gettext target (p…

…ythonGH-127357)

(cherry picked from commit a880358)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>

Doc/Makefile

@@ -144,7 +144,7 @@ pydoc-topics: build
 
 .PHONY: gettext
 gettext: BUILDER = gettext
-gettext: SPHINXOPTS += -d build/doctrees-gettext
+gettext: override SPHINXOPTS := -d build/doctrees-gettext $(SPHINXOPTS)
 gettext: build
 
 .PHONY: htmlview