* gnu/packages/patches/gawk-shell.patch: Update for 4.2.1.
* gnu/packages/patches/gawk-shell.patch: Update for gawk 4.1.3.
* distro: Rename to... * gnu: ... this. Update module names accordingly. * Makefile.am: Adjust accordingly. * po/POTFILES.in: Likewise. * distro.scm: Search for files under /gnu/packages instead of /distro/packages. * gnu/packages/base.scm (ld-wrapper-boot3): Likewise.