Add exception for unicode_east_asian_fw_table.h to headerscheck also

Followup to a315b19

Author: j-naylor

src/tools/pginclude/headerscheck

@@ -110,6 +110,7 @@ do
 
 	# Also not meant to be included standalone.
 	test "$f" = src/include/common/unicode_combining_table.h && continue
+	test "$f" = src/include/common/unicode_east_asian_fw_table.h && continue
 
 	# We can't make these Bison output files compilable standalone
 	# without using "%code require", which old Bison versions lack.