* gnu/packages/minetest.scm: Add the ‘GNU Guix’ header comment. * gnu/packages/notcurses.scm: Likewise. * gnu/packages/presentation.scm: Likewise. * gnu/packages/solidity.scm: Likewise. * guix/build/minetest-build-system.scm: Likewise. * gnu/packages/vnc.scm: Add missing ‘;’. * guix/scripts/import/crate.scm: Remove leading newline. Change-Id: I5294e6067b9348f2929d823a07d4ec335eaa5ecd