Merge branch 'master' into core-updates

doc/guix.texi

gnu/local.mk

gnu/packages/backup.scm

gnu/packages/ccache.scm

gnu/packages/cups.scm

gnu/packages/dns.scm

gnu/packages/embedded.scm

gnu/packages/flex.scm

gnu/packages/games.scm

gnu/packages/gnuzilla.scm

gnu/packages/kde-frameworks.scm

gnu/packages/libusb.scm

gnu/packages/linux.scm

gnu/packages/mail.scm

gnu/packages/maths.scm

gnu/packages/music.scm

gnu/packages/patches/openocd-nrf52.patch

gnu/packages/python.scm

gnu/packages/sdcc.scm

gnu/packages/video.scm