abduco 0.2

Updated abduco formula to the 0.2 release. Removed patch that 0.1 required to compile. Had to do a little inreplacing to work around OSX selectively removing SIGWINCH/VLNEXT in signal.h/termios.h when -D_POSIX_C_SOURCE is defined.
Is the author interested in supporting OSX? If not this should probably be removed from Homebrew.