vanilla: change shebangs to /bin/sh

gnu: move GNU packages to this category

text/yajl: add checksum file

ruby/ruby: fix inclusion of C++ header in extern C

audio/sdl2-mixer: add MP3 support

dev/ctags: initial import, closes #1645

network/openssh: add missing rc file

vanilla: don't make build script executables

vanilla: consolidate licenses and many options

vanilla: update implicit dependencies paragraph

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