K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-03-28T17:06:34.219962Z
K 7
svn:log
V 285
telnet: remove some duplicate definitions, mark terminaltype extern

Most of these were already properly declared and defined elsewhere, this is
effectively just a minor cleanup that fixes the -fno-common build.

-fno-common will become the default in GCC10/LLVM11.

MFC after:	3 days

END