Build failure from git HEAD

[Pavel Raiskup]

The build on Fedora suddenly started to fail:
https://github.com/praiskup/tar/commits/ci

Seems like since the "build: update gnulib and paxutils submodules to latest"
commit.

Build failure:
make  distdir-am
make[3]: Entering directory '/workdir/tar/gnu'
make[3]: Leaving directory '/workdir/tar/gnu'
make[2]: Leaving directory '/workdir/tar/gnu'
 (cd lib && make  top_distdir=../tar-1.34.90 distdir=../tar-1.34.90/lib \
     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)
make[2]: Entering directory '/workdir/tar/lib'
  GEN      rmt-command.h
make  distdir-am
make[3]: Entering directory '/workdir/tar/lib'
make[3]: Leaving directory '/workdir/tar/lib'
make[2]: Leaving directory '/workdir/tar/lib'
 (cd rmt && make  top_distdir=../tar-1.34.90 distdir=../tar-1.34.90/rmt \
     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)
make[2]: Entering directory '/workdir/tar/rmt'
make  distdir-am
make[3]: Entering directory '/workdir/tar/rmt'
make[3]: Leaving directory '/workdir/tar/rmt'
make[3]: *** No rule to make target 'DISTFILES', needed by 'distdir-am'.  Stop.
make[2]: Leaving directory '/workdir/tar/rmt'
make[2]: *** [Makefile:1605: distdir] Error 2
make[1]: Leaving directory '/workdir/tar'
make[1]: *** [Makefile:1682: distdir-am] Error 1
make: *** [Makefile:1675: distdir] Error 2

Full log file (will be removed soon):
https://download.copr.fedorainfracloud.org/results/praiskup/tar-upstream-head/srpm-builds/04512935/builder-live.log.gz

Pavel