Mesa (staging/19.1): meson: Add dep_thread dependency.

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Module: Mesa
Branch: staging/19.1
Commit: 6df891afa6d0643d72667bf7f84bbe246214a712
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6df891afa6d0643d72667bf7f84bbe246214a712

Author: Vinson Lee <vlee at freedesktop.org>
Date:   Thu Jun 13 15:08:27 2019 -0700

meson: Add dep_thread dependency.

Fix this build error on Ubuntu 18.04.

/usr/bin/ld: src/util/libmesa_util.a(u_cpu_detect.c.o): undefined reference to symbol 'pthread_once@@GLIBC_2.2.5'

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110663
Suggested-by: Eric Engestrom <eric@@engestrom.ch>
Signed-off-by: Vinson Lee <vlee at freedesktop.org>
Reviewed-by: Eric Anholt <eric at anholt.net>
Acked-by: Eric Engestrom <eric at engestrom.ch>
(cherry picked from commit 730ceeddb557cec08a502e82b7faeb689bc91d2a)

---

 src/gallium/tests/trivial/meson.build | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gallium/tests/trivial/meson.build b/src/gallium/tests/trivial/meson.build
index bbb25519e12..1f912d5aa46 100644
--- a/src/gallium/tests/trivial/meson.build
+++ b/src/gallium/tests/trivial/meson.build
@@ -24,6 +24,7 @@ foreach t : ['compute', 'tri', 'quad-tex']
     '@0 at .c'.format(t),
     include_directories : inc_common,
     link_with : [libmesa_util, libgallium, libpipe_loader_dynamic],
+    dependencies : dep_thread,
     install : false,
   )
 endforeach