fluidsynth: upgrade to 1.1.6

  First version had no [PATCH] on subject line and non-helpful "inherit gettext"

  * now hosted at sourceforge
  * drop unrecognized option for readline

  NOTE: autotools is deprecated
  TODO: investigate cmake build

Signed-off-by: Tim Orling <TicoTimo@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>