[meta] Use the Rust crate for settings generation;

cranelift/codegen/meta-python/build.py

@@ -5,7 +5,6 @@
 from __future__ import absolute_import
 import argparse
 import isa
-import gen_settings
 import gen_build_deps
 import gen_encoding
 import gen_binemit
@@ -43,7 +42,6 @@ def main():
     isas = isa.all_isas()
     number_all_instructions(isas)
 
-    gen_settings.generate(isas, out_dir)
     gen_encoding.generate(isas, out_dir)
     gen_binemit.generate(isas, out_dir)
     gen_build_deps.generate()