[CF 5922] v2 - update-po for PGXS does not work

This branch was automatically generated by a robot using patches from an
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https://commitfest.postgresql.org/patch/5922

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Patch(es): https://www.postgresql.org/message-id/[email protected]
Author(s): Álvaro Herrera, Ryo Matsumura

Author: Commitfest Bot

src/nls-global.mk

@@ -142,8 +142,13 @@ init-po: po/$(CATALOG_NAME).pot
 # For performance reasons, only calculate these when the user actually
 # requested update-po or a specific file.
 ifneq (,$(filter update-po %.po.new,$(MAKECMDGOALS)))
+ifdef PGXS
+ALL_LANGUAGES := $(shell find . -name '*.po' -print | sed 's,^.*/\([^/]*\).po$$,\1,' | LC_ALL=C sort -u)
+all_compendia := $(shell find . -name '*.po' -print | LC_ALL=C sort)
+else
 ALL_LANGUAGES := $(shell find $(top_srcdir) -name '*.po' -print | sed 's,^.*/\([^/]*\).po$$,\1,' | LC_ALL=C sort -u)
 all_compendia := $(shell find $(top_srcdir) -name '*.po' -print | LC_ALL=C sort)
+endif
 else
 ALL_LANGUAGES = $(AVAIL_LANGUAGES)
 all_compendia = FORCE