[config/ucd] Add HB_NO_UNICODE_UNASSIGNED and activate in HB_TINY
Saves another 12kb:
$ python ./gen-ucd-table.py ucd.nounihan.grouped.zip > hb-ucd-table.hh && make -j5 CPPFLAGS='-Os -DHB_TINY' -C ~/hb/build/src/ && size ~/hb/build/src/.libs/libharfbuzz_la-hb-ucd.o
INFO: Loading UCDXML...
INFO: Preparing data tables...
INFO: Generating output...
INFO: Compression=1:
INFO: Dataset=gc FullCost=18612
INFO: Dataset=ccc FullCost=3550
INFO: Dataset=bmg FullCost=1548
INFO: Dataset=sc FullCost=17765
INFO: Dataset=dm FullCost=13325
INFO: Compression=3:
INFO: Dataset=gc FullCost=10726
INFO: Dataset=ccc FullCost=2389
INFO: Dataset=bmg FullCost=1052
INFO: Dataset=sc FullCost=13669
INFO: Dataset=dm FullCost=7780
INFO: Compression=5:
INFO: Dataset=gc FullCost=8274
INFO: Dataset=ccc FullCost=2055
INFO: Dataset=bmg FullCost=908
INFO: Dataset=sc FullCost=4073
INFO: Dataset=dm FullCost=7780
INFO: Done.
Part of https://github.com/harfbuzz/harfbuzz/issues/1652
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