Add dependency info to packages

A variable called DEPENDS in recipes contains the runtime dependency
information for packages. These get added to the package during tarring.

ffmpeg: Switch to a working release branch, fix hardcoded arch

ffmpeg: Remove unnecessary disable flags

Add ffmpeg recipe

A couple fixes for perl, and initial recipes for automake and autoconf

Recipe for perl

Add -i to autoreconf for Curl

Bump python version

Use release tarball for curl, with a couple patches

Add --debug argument to cook.sh to build in debug mode, unstripped

Enable 'backtrace' feature in libstd, to allow backtraces

Simplify git patch a bit

Newlib now has a workaround for this, and it was resulting in a lot of
changes.

Fix ncurses failing to compile.

Added a cpp flag that is required for certain versions of gcc.

Add symlinks to uutils package

Add recipe for readline

Add recipe for ncurses