Update to 6.8.9-3 .
Use USES=compiler:openmp for the OPENMP option
Ditch the use of perl for patching etc  and silence perl threaded check 
-delay option spurious message should be fixed 
JASPER option was replace by JPEG2000 for JP2k support.
Put 16BIT_PIXEL and HDRI option separate option block. These options change
the library name, so the user needs to take this into consideration.
Use new LIB_DEPENDS syntax.
Use @sample for config files.
Sprinkle some USES=pkgconfig for some ports, since we don't pull it in
anymore at run-time.
PR: 185462 
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