Adjust gen_dynamic_list for PowerPC function descriptors

  nm_out = nm_proc.communicate()[0].decode().split('\n')

  if nm_proc.returncode != 0:

    raise subprocess.CalledProcessError(nm_proc.returncode, 'nm')

  func_symbols = ['T', 'W']

  # On PowerPC, nm prints function descriptors from .data section.

  if os.uname()[4] in ["powerpc", "ppc64"]:

    func_symbols += ['D']

  for line in nm_out:

    cols = line.split(' ')

    if (len(cols) == 3 and cols[1] in ('T', 'W')) :

    if len(cols) == 3 and cols[1] in func_symbols :

      functions.append(cols[2])

  return functions