Fix Mac adb build.

The Mac doesn't have <termio.h>, and it looks like the canonical place for
struct winsize is <sys/ioctl.h> anyway.

  system/core/adb/commandline.cpp:44:10: fatal error: 'termio.h' file not found
  #include <termio.h>

Bug: http://b/19734542
Change-Id: I3bfbf58cdb9b582f3b7e2c9ef0977613001cd3ac