Bug#921512: GCC 9 ftbfs on alpha

Package: src:gcc-9
Severity: important

At least in a cross build according to
https://launchpadlibrarian.net/409942596/buildlog_ubuntu-disco-amd64.gcc-9-cross-ports_0ubuntu1_BUILDING.txt.gz

The native alpha build wasn't yet started.

dh_movefiles -plibgfortran-9-dev-alpha-cross
usr/lib/gcc-cross/alpha-linux-gnu/9/include/ISO_Fortran_binding.h
dh_movefiles:
debian/tmp/usr/lib/gcc-cross/alpha-linux-gnu/9/include/ISO_Fortran_binding.h not
found (supposed to put it in libgfortran-9-dev-alpha-cross)
tar: /<<PKGBUILDDIR>>/gcc/debian/movelist: Cannot stat: No such file or directory
tar: Error is not recoverable: exiting now
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors