After commit 898ab8da wine would no longer
build on musl.

Issue is that apparently TCSETS2 isn't defined when including sys/ioctl.h.

A little digging shows that glibc goes ahead and includes asm/ioctls.h in
sys/ioctl.h, providing said macro.  Musl on the other hand doesn't and relies
on bits/ioctl.h, which lacks said macro.
Signed-off-by: Fotios Valasiadis <fvalasiad@gmail.com>