vim-patch:7.4.245

Problem:    Crash for "vim -u NONE -N  -c '&&'".
Solution:   Check for the pattern to be NULL. (Dominique Pelle)

https://code.google.com/p/vim/source/detail?r=80421d934ebde183ce545ab8d9eb3a4c2065c169
Added os_isatty
Removed mch_check_win
Removed mch_input_isatty
Replace explicit uv_guest_handle(fd) == UV_TTY by os_isatty