package/bullet: extras needs NPTL

Fixes:
 - http://autobuild.buildroot.org/results/9c6325e6cc86116d1e8c940e0fcfe94243faa6de

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Tested-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/bullet/bullet.mk

@@ -16,8 +16,8 @@ BULLET_CONF_OPTS = -DBUILD_UNIT_TESTS=OFF \
 	-DBUILD_BULLET2_DEMOS=OFF \
 	-DBUILD_BULLET3=OFF
 
-# extras needs dlfcn.h and threads
-ifeq ($(BR2_STATIC_LIBS):$(BR2_TOOLCHAIN_HAS_THREADS),:y)
+# extras needs dlfcn.h and NPTL (pthread_barrier_init)
+ifeq ($(BR2_STATIC_LIBS):$(BR2_TOOLCHAIN_HAS_THREADS_NPTL),:y)
 BULLET_CONF_OPTS += -DBUILD_EXTRAS=ON
 else
 BULLET_CONF_OPTS += -DBUILD_EXTRAS=OFF