termios: Define struct winsize on all platforms.

[Collin Funk]

Hi,

A prerequisite of implementing tcgetwinsize and tcsetwinsize as
specified by POSIX 2024 is defining struct winsize on all platforms in
termios.h.

This patch defines the struct on Windows where it is missing and checks
if it is defined in sys/ioctl.h like glibc. POSIX 2024 states that it
should be defined in termios.h so I reported a glibc bug here [1].

I haven't tested other platforms yet but hopefully it should all be
handled in termios.h there or through a single #include like glibc.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=32074

0001-termios-Define-struct-winsize-on-all-platforms.patch
Description: Text Data

0002-termios-tests-Check-for-struct-winsize.patch
Description: Text Data