Fix 'make check' linking error with glibc < 2.17.
CXXLD main-test
../../../../src/mesa/.libs/libmesa.a(libmesautil_la-u_queue.o): In function `u_thread_get_time_nano':
src/util/../../src/util/u_thread.h:84: undefined reference to `clock_gettime'
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
$(top_builddir)/src/mesa/libmesa.la \
$(top_builddir)/src/gtest/libgtest.la \
$(PTHREAD_LIBS) \
- $(DLOPEN_LIBS)
+ $(DLOPEN_LIBS) \
+ $(CLOCK_LIB)
if HAVE_SHARED_GLAPI
AM_CPPFLAGS += -DHAVE_SHARED_GLAPI