Move the 'meta' dir to 'lib/cretonne/meta'.

The 'lib/cretonne' directory will be the new root of a stand-alone
cretonne crate containg both Python and Rust sources.

This is in preparation for publishing crates on crates.io.

lib/cretonne/meta/build.py

@@ -0,0 +1,26 @@
+# Second-level build script.
+#
+# This script is run from src/libcretonne/build.rs to generate Rust files.
+
+from __future__ import absolute_import
+import argparse
+import isa
+import gen_types
+import gen_instr
+import gen_settings
+import gen_build_deps
+import gen_encoding
+
+parser = argparse.ArgumentParser(description='Generate sources for Cretonne.')
+parser.add_argument('--out-dir', help='set output directory')
+
+args = parser.parse_args()
+out_dir = args.out_dir
+
+isas = isa.all_isas()
+
+gen_types.generate(out_dir)
+gen_instr.generate(isas, out_dir)
+gen_settings.generate(isas, out_dir)
+gen_encoding.generate(isas, out_dir)
+gen_build_deps.generate()