ffmpeg 0.10: fix build on GCC4.
Add a recipe for python-requests
Add recipe for dateutil 1.5

- the magic is in --single-version-externally-managed to disable
those (easter) egg things...
cf.
https://wiki.debian.org/Python/FAQ#How_should_we_package_Python_eggs.3F

- --root is required so just pass /

- also, python must be called without any path, else it setuptools uses
it as an extra prefix for install... so we munge PATH and call python.
Add recipe for lxml

And patch, because they happily hardcode -lm in there...
Add recipe for python mechanize
ffmpeg 0.10: mark as working on GCC4.
ca_root_certificates: Switch back to old date format.

As requested by Oliver.
Whitespace cleanup
Fix xcb_proto recipe

Again python stuff...
Mark libxcp as tested on gcc2 at least
util_macros: mark the git recipe as untested.

It doesn't specify any git hash so it's not reliable.
util_macros: remove old recipe
util_macros: Add a recipe for 1.19.0
xproto: Mark git recipe as untested
xproto: Add recipe for 7.0.26
xproto: Remove old recipe and patch
libxau: Add recipe for 1.0.8
xcb_proto: Fix the pkg-config file

It is generated using .config.status which doesn't get the exported
variables.
libxcb: Check for libnetwork first before libsocket
libxcb: Fix recipe