meson: fix builds on Solaris 11.4

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
3 jobs for solaris-fixes in 5 minutes and 51 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Docker Image
passed debian-testing #647526

00:00:21

 
  Build And Test
passed autotools-build-and-test #647527

00:05:30

passed meson-build-and-test #647528

00:02:37