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>
(cherry picked from commit e6ab7f9f)
3 jobs for test-isastream-for-1.20 in 2 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Docker Image
passed #1005388
debian-testing

00:00:18

 
  Build And Test
passed #1005389
autotools-build-and-test

00:02:40

passed #1005390
meson-build-and-test

00:01:18