main/musl: use upstream getopt_long

Drop our getopt_long from BSD, now that upstream support all
GNU extensions we required.
main/binutils: revert to ld.bfd as default

ref #3616 - Seems gold produces invalid libstdc++ for x86, and cannot
be yet enabled as default linker.

Keep building it, and split it to a separate package.
Revert "main/musl: use upstream getopt_long"

This reverts commit 21d10d3c2c3687b1475a4616ec9f341e3931f05b.

This is broken still, and was pushed by accident.
testing/youtube-dl: upgrade to 2014.12.12.1
main/adwaita-icon-theme: upgrade to 3.14.1
main/btrfs-progs: upgrade to 3.17.3
main/ccache: upgrade to 3.2
main/gnutls: upgrade to 3.3.11
main/libass: upgrade to 0.12.0
main/libguess: upgrade to 1.2