GenericFunction::sigreturn: handle future.
GenericFunction::sigreturn: handle future.

Change-Id: I69e4187204b41820d174507caa3a4190074a91e1
Reviewed-on: http://gerrit.aldebaran.lan:8080/15867
Reviewed-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>
Tested-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,vbarbaresi/libqi,bsautron/libqi,aldebaran/libqi