compile fix: <stddef.h> needed for size_t
x11vnc: Fix more hard-coded /bin/su
openocd: bump from 0.4.0 to 0.6.1

Also:
 * Remove commented out "GuruPlug installer" stuff that hasn't worked
   since openocd 0.2.0 (according to the comments).
 * Build with support for the following JTAG hardware:
   - Segger J-Link
   - Raisonance RLink
   - Keil ULINK
   - STMicroelectronics ST-Link
urbanterror: Update to 4.2.009.
urbanterror: Correction for previous commit.
all-packages.nix: Uncomment e17.
iwlwifi-4965 fix download url
pngcrush: update to fix compilation with libpng-1.6.*
httpie: fix
Fix Hydrogen to build with JACK 1.9.9.5

This patches the Hydrogen scons build script to work a failure to
parse the JACK version correctly. If I understand correctly upstream
Hydrogen now uses cmake instead of Scons, so this shouldn't be a
problem with the next Hydrogen release.
x86info: fix
linphone: minor update and fix
minidlna: Update to 1.0.25 and use ffmpeg instead of libav
mediastreamer: forgotten update needed for linphone
vmime: fix via minor update
e17.embryo: Fix meta.

Meta attributes, if they are lists, must be lists of strings.
Add wayland library
WIP
pure: update and fix by patching
Revert "WIP", sorry, I got confused, somehow

This reverts commit 524d9b656e1c72d3fdeebeb674f0c494f9fc8ba8.