xorg-server: enable xinerama support, libXinerama is needed for xorg-server-1.15, so remove optional support for now

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Revert "nettle: build as static library"

This reverts commit f848c46de337fed600e8b6148da62a49ad885f90.
Revert "gmp: build as static library"

This reverts commit 7ba51f87adc188f8717a8027a4bed1213dde7564.
update TODO
linux: update to linux-3.13.0-rc8
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
pulseaudio: do not check homedir ownership
xf86-video-nvidia: update to xf86-video-nvidia-331.38

fixes no hdmi audio on some ION1s

ref #2767
attr: update to attr-2.4.47

tryfix #2876
config/functions: add get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
RTL8188EU: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
RTL8192CU: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bcm_sta: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
dvbhdhomerun: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
tbs-linux-drivers: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
vboxguest: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nvidia-legacy: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nvidia: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>
open-vm-tools: replace kernel_version() with get_module_dir()

Signed-off-by: Stephan Raue <stephan@openelec.tv>