xfree86: Test presence of isastream()

isastream() was never more than a stub in glibc, and was removed in
glibc-2.30 by commit a0a0dc83173c ("Remove obsolete, never-implemented
XSI STREAMS declarations").

Bug: https://bugs.gentoo.org/700838
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>
3 jobs for test-isastream in 6 minutes and 53 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Docker Image
passed #1005382
debian-testing

00:00:30

 
  Build And Test
passed #1005383
autotools-build-and-test

00:06:22

passed #1005384
meson-build-and-test

00:01:55