Sort pot input files

Git-Dch: ignore

doc/po/apt-doc.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: apt-doc 1.1~exp12\n"
 "Report-Msgid-Bugs-To: APT Development Team <deity@lists.debian.org>\n"
-"POT-Creation-Date: 2015-09-11 23:36+0200\n"
+"POT-Creation-Date: 2015-09-12 11:06+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"

po/makefile

@@ -37,10 +37,9 @@ $(POTFILES) : $(PO)/%.pot :
 	cmp --silent $(PO)/domains/$*/sh.pot.tmp $(PO)/domains/$*/sh.pot || \
 		mv $(PO)/domains/$*/sh.pot.tmp $(PO)/domains/$*/sh.pot
 # From C/C++ source
-	cat $(PO)/domains/$*/*.srclist > $(PO)/POTFILES_$*.in
+	cat $(PO)/domains/$*/*.srclist | sort > $(PO)/POTFILES_$*.in
 	$(XGETTEXT) --default-domain=$* --directory=$(BASE) \
 	  --add-comments --foreign --keyword=_ --keyword=N_ \
-          # avoid the huge churn on each make update-pot
           --no-location \
 	  --keyword=P_:1,2 \
 	  --files-from=$(PO)/POTFILES_$*.in -o $(PO)/domains/$*/c.pot.tmp