* gnu/packages/glib.scm (glib): Update to 2.58.1.
[build-system]: Use meson-build-system.
[outputs]: Remove "doc" as the documentation files are no longer included.
[inputs]: Move libffi, util-linux, and zlib from here...
[propagated-inputs]: ...to here; add libselinux.
[arguments]: Remove key "disallowed-references" as it is not supported by the
meson-build-system; delete "bootstrap" phase to prevent use of autotools;
adjust "pre-build" phase; move "disable-failing-tests" phase after "unpack";
disable two more tests in "disable-failing-tests" phase; add phase
"move-executables"; remove configure flags.