[USE] Start moving Unicode-to-USE mapping into Python code

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index 44de2b6..947d279 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -294,7 +294,7 @@
 	$(AM_V_GEN) $(builddir)/$^ > hb-ot-shape-complex-indic-table.cc \
 	|| ($(RM) hb-ot-shape-complex-indic-table.cc; false)
 
-use-table: gen-use-table.py IndicSyllabicCategory.txt IndicPositionalCategory.txt Blocks.txt
+use-table: gen-use-table.py IndicSyllabicCategory.txt IndicPositionalCategory.txt UnicodeData.txt Blocks.txt
 	$(AM_V_GEN) $(builddir)/$^ > hb-ot-shape-complex-use-table.cc \
 	|| ($(RM) hb-ot-shape-complex-use-table.cc; false)