eglibc: add gai.conf and enable support to prefer ipv4 over ipv6

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv into openelec-settings
Merge branch 'openelec-settings' of github.com:OpenELEC/OpenELEC.tv into openelec-settings