sota.conf.inc: remove SOURCE_DATE_EPOCH and REPRODUCIBLE_TIMESTAMP_ROOTFS

* SOURCE_DATE_EPOCH set to 0 is now causing python3-setuptools-native build to fail with:

  creating build/bdist.linux-x86_64/wheel/setuptools-59.5.0.dist-info/WHEEL
  creating '/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/dist/tmpqgh1qmw6/setuptools-59.5.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/setuptools-59.5.0/setuptools/build_meta.py", line 230, in build_wheel
      return self._build_with_temp_dir(['bdist_wheel'], '.whl',
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/setuptools-59.5.0/setuptools/build_meta.py", line 215, in _build_with_temp_dir
      self.run_setup()
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/setuptools-59.5.0/setuptools/build_meta.py", line 158, in run_setup
      exec(compile(code, __file__, 'exec'), locals())
    File "setup.py", line 87, in <module>
      dist = setuptools.setup(**setup_params)
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/setuptools-59.5.0/setuptools/__init__.py", line 153, in setup
      return distutils.core.setup(**attrs)
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/distutils/dist.py", line 966, in run_commands
      self.run_command(cmd)
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/site-packages/wheel/bdist_wheel.py", line 361, in run
      wf.write_files(archive_root)
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/site-packages/wheel/wheelfile.py", line 136, in write_files
      self.write(path, arcname)
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/site-packages/wheel/wheelfile.py", line 147, in write
      zinfo = ZipInfo(arcname or filename, date_time=get_zipinfo_datetime(st.st_mtime))
    File "/OE/lge/build/webosose/kirkstone/BUILD/work/x86_64-linux/python3-setuptools-native/59.5.0-r0/recipe-sysroot-native/usr/lib/python3.10/zipfile.py", line 362, in __init__
      raise ValueError('ZIP does not support timestamps before 1980')
  ValueError: ZIP does not support timestamps before 1980

  The st.st_mtime is correct timestamp, but get_zipinfo_datetime function in python3.10/site-packages/wheel/wheelfile.py
  will prefer SOURCE_DATE_EPOCH when set:

  def get_zipinfo_datetime(timestamp=None):
      # Some applications need reproducible .whl files, but they can't do this without forcing
      # the timestamp of the individual ZipInfo objects. See issue #143.
      timestamp = int(os.environ.get('SOURCE_DATE_EPOCH', timestamp or time.time()))
      return time.gmtime(timestamp)[0:6]

  Which leads to 1.1.1970 which isn't supported by ZIP.

  The default value will use get_source_date_epoch_value:
  # $SOURCE_DATE_EPOCH [2 operations]
  #   exported /OE/lge/build/webosose/kirkstone/oe-core/meta/conf/bitbake.conf:672
  #     [export] "1"
  #   set? /OE/lge/build/webosose/kirkstone/oe-core/meta/conf/bitbake.conf:672
  #     "${@get_source_date_epoch_value(d)}"
  # pre-expansion value:
  #   "${@get_source_date_epoch_value(d)}"
  export SOURCE_DATE_EPOCH="1638725317"

  which in this case is:
  python3-setuptools-native/59.5.0-r0/source-date-epoch/__source_date_epoch.txt
  1638725317

  $ date --date='@1638725317'
  Sun Dec  5 18:28:37 CET 2021

  I believe the reproducible builds now enabled by default in oe-core work
  reasonably well and forcing this to 0 as added in:
  3d3a0bf
  af1694c
  is no longer necessary.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

Author: shr-project

conf/distro/sota.conf.inc

@@ -8,8 +8,5 @@ DISTRO_FEATURES:append = " sota usrmerge"
 DISTRO_FEATURES_NATIVE:append = " sota"
 INHERIT += " sota"
 
-export SOURCE_DATE_EPOCH = "0"
-REPRODUCIBLE_TIMESTAMP_ROOTFS = "0"
-
 HOSTTOOLS += "sync"
 HOSTTOOLS_NONFATAL += "java repo"