examples: Allow examples to link on OS X.
examples: Allow examples to link on OS X.

On OS X -liconv is needed in LDFLAGS otherwise
examples do not link. Tested on OS X 10.6.8.

theambient/bitstream_c,kgmoore/bitstream,svogl/bitstream,avble/bitstream,svogl/bitstream,avble/bitstream,theambient/bitstream_c,kierank/bitstream,hiroshiyui/bitstream,svogl/bitstream,gfto/bitstream,hiroshiyui/bitstream,hiroshiyui/bitstream,kierank/bitstream,kgmoore/bitstream,avble/bitstream,kgmoore/bitstream,gfto/bitstream