1.17.2: po/POTFILES not up to date

+ /usr/bin/ninja -v -j48 -C x86_64-redhat-linux-gnu gstreamer-update-po
ninja: Entering directory `x86_64-redhat-linux-gnu'
[0/1] /usr/bin/meson --internal commandrunner /home/tkloczko/rpmbuild/BUILD/gstreamer-1.17.2 /home/tkloczko/rpmbuild/BUILD/gstreamer-1.17.2/x86_64-redhat-linux-gnu po /usr/bin/meson /usr/bin/meson --internal gettext update_po --pkgname=gstreamer --extra-args=--keyword=C_:1c,2@@--flag=g_print:1:c-format@@--flag=g_strdup_printf:1:c-format@@--flag=NC_:2:pass-c-format@@--keyword=g_dpgettext2:2c,3@@--keyword=NC_:1c,2@@--flag=g_printerr:1:c-format@@--keyword=g_dngettext:2,3@@--flag=g_error_new:3:c-format@@--flag=g_sprintf:2:c-format@@--flag=g_markup_printf_escaped:1:c-format@@--flag=C_:2:pass-c-format@@--flag=g_fprintf:2:c-format@@--add-comments@@--flag=g_snprintf:3:c-format@@--flag=g_string_printf:2:c-format@@--flag=g_printf:1:c-format@@--from-code=UTF-8@@--flag=g_dngettext:2:pass-c-format@@--flag=g_string_append_printf:2:c-format@@--keyword=_@@--flag=N_:1:pass-c-format@@--keyword=N_@@--flag=g_log:3:c-format@@--keyword=g_dcgettext:2@@--flag=g_set_error:4:c-format
xgettext: warning: file 'gst/parse/grammar.y' extension 'y' is unknown; will try C
xgettext: error while opening "gst/parse/grammar.y" for reading: No such file or directory
FAILED: meson-gstreamer-update-po
/usr/bin/meson --internal commandrunner /home/tkloczko/rpmbuild/BUILD/gstreamer-1.17.2 /home/tkloczko/rpmbuild/BUILD/gstreamer-1.17.2/x86_64-redhat-linux-gnu po /usr/bin/meson /usr/bin/meson --internal gettext update_po --pkgname=gstreamer --extra-args=--keyword=C_:1c,2@@--flag=g_print:1:c-format@@--flag=g_strdup_printf:1:c-format@@--flag=NC_:2:pass-c-format@@--keyword=g_dpgettext2:2c,3@@--keyword=NC_:1c,2@@--flag=g_printerr:1:c-format@@--keyword=g_dngettext:2,3@@--flag=g_error_new:3:c-format@@--flag=g_sprintf:2:c-format@@--flag=g_markup_printf_escaped:1:c-format@@--flag=C_:2:pass-c-format@@--flag=g_fprintf:2:c-format@@--add-comments@@--flag=g_snprintf:3:c-format@@--flag=g_string_printf:2:c-format@@--flag=g_printf:1:c-format@@--from-code=UTF-8@@--flag=g_dngettext:2:pass-c-format@@--flag=g_string_append_printf:2:c-format@@--keyword=_@@--flag=N_:1:pass-c-format@@--keyword=N_@@--flag=g_log:3:c-format@@--keyword=g_dcgettext:2@@--flag=g_set_error:4:c-format
ninja: build stopped: subcommand failed.

Looks like dist tar gball was not generated using dist target.