Source here are from tinycthread development version from
https://github.com/tinycthread/tinycthread
commit 6957fc8383d6c7db25b60b8c849b29caab1caaee
Fri Sep 30 12:47:32 2016 -0400

Only files needed by freeciv have been included here.
Source files have been renamed to distinguish freeciv copy
from a version in crosser environment.
