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

Patch patch not to call chown

Pass -p to cp, to make running autotools unnecessary

Use system 'pkg' when run on Redox

Add recipe for patch

Make extrautils have xz as a build depend