buildroot

mimic: new package

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
[Thomas:
 - Rewrap Config.in help text
 - Use "depends on" rather than "select" for the audio backend options
 - Slightly simplify some of the prompts for the audio backend selection
 - Remove MIMIC_INSTALL_STAGING = NO, that's the default
 - Use += when assigning MIMIC_DEPENDENCIES
 - Remove double quotes when setting --with-audio=.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>