graphics/libfpx fails with gcc46 because of new warnings

[Andriy Gapon]

files/Makefile.bsd has WARNS=3, but:
/usr/obj/ports/usr/ports/graphics/libfpx/work/libfpx-1.3.1-1/ri_image/ptile.cpp:
In static member function 'static void PTile::FreeAncientBuffers(long int)':
/usr/obj/ports/usr/ports/graphics/libfpx/work/libfpx-1.3.1-1/ri_image/ptile.cpp:778:24:
error: variable 'timeNow' set but not used [-Werror=unused-but-set-variable]
/usr/obj/ports/usr/ports/graphics/libfpx/work/libfpx-1.3.1-1/ri_image/ptile.cpp:
In static member function 'static void PTile::FreeAncientBuffers(long int)':
/usr/obj/ports/usr/ports/graphics/libfpx/work/libfpx-1.3.1-1/ri_image/ptile.cpp:778:24:
error: variable 'timeNow' set but not used [-Werror=unused-but-set-variable]

WARNS=1 helps...
-- 
Andriy Gapon