Remove the paragraph about writing to the Free Software Foundation's
mailing address. The FSF has changed addresses in the past, and may do
so again. In 2021 this is not useful, let's rather have a bit less
boilerplate at the start of source files.
Change-Id: I73be012c01c0108fb6951dbff91d50eb19b40c51
Our build system is based on Debian 9 and EOL Python 3.5, so we have
to maintain backwards compatibility (sigh). Some type hints moved
to comments, some had to be commented out completely. Hopefully,
we can 'un-vandalize' the code by reverting this change once there
will be no requirement to support EOL stuff.
Change-Id: I7211cfbb7549b6e700aa3dd44464ff762fd51185
Related: OS#4006, SYS#4895