Remove: DOS support

In 10 years there was no active development on DOS. Although it
turned out to still work, the FPS was very bad. There is little
interest in the current community to look into this.

Further more, we like to switch to c++11 functions for threads,
which are not implemented by DJGPP, the only current compiler
for DOS.

Additionally, DOS is the only platform which does not support
networking. It is the reason we have tons of #ifdefs to support
disabling networking.

By removing DOS support, we can both use c++11 functions for threads,
and remove all the code related to disabling network. Sadly, this
means we have to see DOS go.

Of course, if you feel up for the task, simply revert this commit,
and implement stub c++11 functions for threads and stub functions
for networking. We are more than happy to accept such Pull Request.

1 files changed, 0 insertions, 48 deletions

diff --git a/os/dos/exe2coff/copying.dj b/os/dos/exe2coff/copying.dj
deleted file mode 100644
index 8a5504784..000000000
--- a/os/dos/exe2coff/copying.dj
+++ /dev/null
@@ -1,48 +0,0 @@
-This is the file "copying.dj".  It does NOT apply to any sources or
-binaries copyrighted by UCB Berkeley, the Free Software Foundation, or
-any other agency besides DJ Delorie and others who have agreed to
-allow their sources to be distributed under these terms.
-
-   Copyright Information for sources and executables that are marked
-   Copyright (C) DJ Delorie
-                 7 Kim Lane
-                 Rochester NH  03867-2954
-
-This document is Copyright (C) DJ Delorie and may be distributed
-verbatim, but changing it is not allowed.
-
-Source code copyright DJ Delorie is distributed under the terms of the
-GNU General Public Licence, with the following exceptions:
-
-* Sources used to build crt0.o, gcrt0.o, libc.a, libdbg.a, and
-  libemu.a are distributed under the terms of the GNU Library General
-  Public License, rather than the GNU GPL.
-
-* Any existing copyright or authorship information in any given source
-  file must remain intact.  If you modify a source file, a notice to that
-  effect must be added to the authorship information in the source file.
-
-* Runtime binaries, as provided by DJ in DJGPP, may be distributed
-  without sources ONLY if the recipient is given sufficient information
-  to obtain a copy of djgpp themselves.  This primarily applies to
-  go32-v2.exe, emu387.dxe, and stubedit.exe.
-
-* Runtime objects and libraries, as provided by DJ in DJGPP, when
-  linked into an application, may be distributed without sources ONLY
-  if the recipient is given sufficient information to obtain a copy of
-  djgpp themselves.  This primarily applies to crt0.o and libc.a.
-
------
-
-Changes to source code copyright BSD, FSF, or others, by DJ Delorie
-fall under the terms of the original copyright.  Such files usually
-have multiple copyright notices in them.
-
-A copy of the files "COPYING" and "COPYING.LIB" are included with this
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