bash-3.2.5-7: COLUMNS and LINES variables are not set

[Mark Edgar]

It seems that bash for Cygwin does not set the COLUMNS and LINES shell 
variables, neither at startup nor when WINCH is delivered.  Defining 
TIOCGWINSZ by including <termios.h> in lib/sh/winsize.c fixes the issue.

                                        -Mark
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