Given that DJGPP 2.02 was released in 1998, may I remove the two files
which are added to support earlier releases, that is:

msdos/is_exec.c
msdos/sigaction.c

? They come with a licensing exception, its explanation, and notes in other
files (e.g. admin/notes/copyright) that maintainers not concerned with the
MS-DOS port may have to read. This therefore removes a small bit of
unnecessary clutter. My patch touches the following files:

admin/authors.el
admin/notes/copyright
etc/PROBLEMS (the problems no longer exist!)
make-dist
msdos/INSTALL
msdos/README

as well as the two removed files. No code (other than make-dist) is
affected, as the method of using them was entirely reliant on manual
intervention (the instructions said to compile and link the files into the
Emacs executable).

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