micropython-lib: Update to master, split target package

The package has been reworked to install the same files that are
available to be downloaded/installed by mip, the package manager new to
MicroPython 1.20.0.

This also splits the original target package into four:

* micropython-lib
  * Includes packages common to all MicroPython ports (python-stdlib,
    python-ecosys, micropython)
  * Contains mpy bytecode files

* micropython-lib-src
  * Includes packages common to all MicroPython ports (python-stdlib,
    python-ecosys, micropython)
  * Contains py source files

* micropython-lib-unix
  * Includes packages specific to the MicroPython Unix port (unix-ffi)
  * Contains mpy bytecode files
  * Installs a specific launcher (micropython-unix) that adds the Unix
    package directory into MicroPython's library path

* micropython-lib-unix-src
  * Includes packages specific to the MicroPython Unix port (unix-ffi)
  * Contains py source files

This also updates the package license, title, and description.

Patches:

* 001-build-unix-ffi.patch

  This enables the repo build script to also build the Unix-specific
  packages. Not sure if upstream is open to accepting this since the
  Unix-specific packages don't fit well into the existing package
  distribution mechanism.

* 002-add-unix-ffi-os-path.patch and 003-add-unix-ffi-uu.patch

  These fix instances where the unix-ffi version of the os package is
  overridden by the python-stdlib version. These have been submitted to
  upstream: https://github.com/micropython/micropython-lib/pull/672

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/micropython-lib/patches/001-build-unix-ffi.patch

@@ -0,0 +1,37 @@
+--- a/tools/build.py
++++ b/tools/build.py
+@@ -284,7 +284,7 @@ def _update_index_package_metadata(index
+                 index_package_json["versions"][v].append(metadata.version)
+ 
+ 
+-def build(output_path, hash_prefix_len, mpy_cross_path):
++def build(output_path, unix_ffi, hash_prefix_len, mpy_cross_path):
+     import manifestfile
+     import mpy_cross
+ 
+@@ -310,7 +310,7 @@ def build(output_path, hash_prefix_len,
+ 
+     # For now, don't process unix-ffi. In the future this can be extended to
+     # allow a way to request unix-ffi packages via mip.
+-    lib_dirs = ["micropython", "python-stdlib", "python-ecosys"]
++    lib_dirs = ["unix-ffi"] if unix_ffi else ["micropython", "python-stdlib", "python-ecosys"]
+ 
+     mpy_version, _mpy_sub_version = mpy_cross.mpy_version(mpy_cross=mpy_cross_path)
+     mpy_version = str(mpy_version)
+@@ -438,6 +438,7 @@ def main():
+ 
+     cmd_parser = argparse.ArgumentParser(description="Compile micropython-lib for serving to mip.")
+     cmd_parser.add_argument("--output", required=True, help="output directory")
++    cmd_parser.add_argument("--unix-ffi", action="store_true", help="process unix-ffi packages")
+     cmd_parser.add_argument("--hash-prefix", default=8, type=int, help="hash prefix length")
+     cmd_parser.add_argument("--mpy-cross", default=None, help="optional path to mpy-cross binary")
+     cmd_parser.add_argument("--micropython", default=None, help="path to micropython repo")
+@@ -447,7 +448,7 @@ def main():
+         sys.path.append(os.path.join(args.micropython, "tools"))  # for manifestfile
+         sys.path.append(os.path.join(args.micropython, "mpy-cross"))  # for mpy_cross
+ 
+-    build(args.output, hash_prefix_len=max(4, args.hash_prefix), mpy_cross_path=args.mpy_cross)
++    build(args.output, args.unix_ffi, hash_prefix_len=max(4, args.hash_prefix), mpy_cross_path=args.mpy_cross)
+ 
+ 
+ if __name__ == "__main__":