Variety of improvements

- Rename sources to distfiles for clarity.
- Per sys(a/c) distfiles to reduce rootfs.py processing and reduce RAM
  usage in sysa.
- Canonicalise early kaem mes/tcc files to kaem script conventions.
- Cleanup unused setup in python.

sysb.py

@@ -2,36 +2,20 @@
 """System B"""
 # SPDX-License-Identifier: GPL-3.0-or-later
 # SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
-# SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2021-22 fosslinux <fosslinux@aussies.space>
 
 import os
-import shutil
 
-from lib.utils import copytree
 from lib.sysgeneral import SysGeneral
 
 class SysB(SysGeneral):
     """
     Class responsible for preparing sources for System B.
     """
-    def __init__(self, arch, preserve_tmp, tmpdir, chroot):
+    def __init__(self, arch, preserve_tmp, chroot):
         self.git_dir = os.path.dirname(os.path.join(__file__))
         self.arch = arch
         self.preserve_tmp = preserve_tmp
         self.chroot = chroot
 
         self.sys_dir = os.path.join(self.git_dir, 'sysb')
-        if tmpdir is None:
-            self.tmp_dir = os.path.join(self.sys_dir, 'tmp')
-        else:
-            self.tmp_dir = os.path.join(tmpdir, 'sysb')
-            os.mkdir(self.tmp_dir)
-
-        self.prepare()
-
-    def prepare(self):
-        """
-        Prepare directory structure for System B.
-        """
-        self.mount_tmpfs()
-        copytree(self.sys_dir, self.tmp_dir, ignore=shutil.ignore_patterns("tmp"))