Fix some trivial compiler warnings for the Haiku and BSD backends

Fix some trivial compiler warnings for the Haiku and BSD backends

  * [-Wformat=] format 'S' expects argument of type 'T1', but argument N has type 'T2'
  * [-Wmissing-declarations] no previous declaration for 'func'
  * [-Wreorder] 'Class::Member' will be initialized after
  * [-Wsign-compare] comparison between signed and unsigned integer expressions
  * [-Wunused-but-set-variable] variable 'v' set but not used
  * [-Wunused-parameter] unused parameter 'p'

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>