Avoid trying to redefine sys_signame on Android (#253)
Avoid trying to redefine sys_signame on Android (#253)

On Android <signal.h> defines sys_signame, so trying to redefine it
causes the build to fail.
tsl0922/ttyd,tsl0922/ttyd,tsl0922/ttyd,tsl0922/ttyd,tsl0922/ttyd