Update POTFILES.in.

docs/DEVELOPERS.md

@@ -146,6 +146,7 @@ The package maintainer should run through these steps for a new release:
    * <https://cvsweb.openbsd.org/ports/sysutils/pv/>
    * <https://packages.fedoraproject.org/pkgs/pv/pv/>
  * Run "`make indent; make indent indentclean check`"
+ * Check that `po/POTFILES.in` is up to date
  * Run "`make -C po update-po`"
  * Run "`make analyse`" and see whether remaining warnings can be addressed
  * Version bump and documentation checks:

po/POTFILES.in

@@ -4,8 +4,10 @@ src/main/main.c
 src/main/options.c
 src/main/remote.c
 src/main/version.c
+src/pv/calc.c
 src/pv/cursor.c
 src/pv/display.c
+src/pv/elapsedtime.c
 src/pv/file.c
 src/pv/loop.c
 src/pv/number.c