swift234

Use TIOCSTI instead of TIOCGWINSZ in Glibc test

validation-test/stlib/Glibc.swift was failing on powerpc64le due to the
missing TIOCGWINSZ symbol.  Since (from what I can tell) this is just a
random tty ioctl, replace it with a different ioctl that should be more
commonly defined.

Signed-off-by: Russell Currey <ruscur@russell.cc>