Merge branch 'core-updates'

build-aux/check-available-binaries.scm

build-aux/hydra/gnu-system.scm

build-aux/list-packages.scm

etc/completion/bash/guix

gnu-system.am

gnu/packages/audio.scm

gnu/packages/autotools.scm

gnu/packages/base.scm

gnu/packages/cmake.scm

gnu/packages/commencement.scm

gnu/packages/cross-base.scm

gnu/packages/databases.scm

gnu/packages/gcc.scm

gnu/packages/gl.scm

gnu/packages/gtk.scm

gnu/packages/ld-wrapper.in

gnu/packages/ld-wrapper2.in

gnu/packages/patches/cmake-fix-tests.patch

gnu/packages/patches/gcc-libvtv-runpath.patch

gnu/packages/patches/perl-module-pluggable-search.patch