- Build slibtool_host in build level 0 and slibtool in build level 1.
    - Fetch lazy in 006.musl.full.build.
    - Infer the default number of make(1) jobs to run simultaneously from /proc/cpuinfo.
    - Merges <https://ftp.gnu.org/gnu/bash/bash-4.3-patches/> into bash-4.3.local.patch.
    - Print all attributes off SGR at the start of a message in log_msg().
    - Simplify 009.gcc.full.build and fetch{,_git}().
    - Only create library archives for shared objects that have actually been installed.
    - Only invoke git-clone(1) and wget(1) in fetch{_git,}() when necessary.