Mesa (master): util: Fix build on old glibc.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: b94ddc181bc514bd32c1d4103aa1c7582a7a60ff
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b94ddc181bc514bd32c1d4103aa1c7582a7a60ff

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Jul 31 14:47:12 2017 -0700

util: Fix build on old glibc.

We need to link librt for u_thread.h's clock_gettime() call.

Fixes: b822d9dd67b5 ("gallium/util: move u_queue.{c,h} to src/util")
Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/util/Makefile.am | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/util/Makefile.am b/src/util/Makefile.am
index a8352a9053..4512dc99d5 100644
--- a/src/util/Makefile.am
+++ b/src/util/Makefile.am
@@ -46,7 +46,9 @@ libmesautil_la_SOURCES = \
 	$(MESA_UTIL_FILES) \
 	$(MESA_UTIL_GENERATED_FILES)
 
-libmesautil_la_LIBADD = $(ZLIB_LIBS)
+libmesautil_la_LIBADD = \
+	$(CLOCK_LIB) \
+	$(ZLIB_LIBS)
 
 libxmlconfig_la_SOURCES = $(XMLCONFIG_FILES)
 libxmlconfig_la_CFLAGS = \