comix-cursors: new package

[Thomas:
 - rename from comix_cursors to comix-cursors
 - change prompt from comix to comix-cursors in order to match the
   package name
 - use <pkg>_STRIP_COMPONENTS instead of overriding the extract
   commands.
 - the license is GPLv3 according to the project website.]

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>