ti-utils: link with pthread to avoid build failure

Add '-lpthread' option to LIBS in ti-utils.mk file
to link this package with pthread

Fixes:
http://autobuild.buildroot.net/results/132/132072d849a3ec572aa80e51833bf6906a54400a//

Signed-off-by: Yuvaraj Patil <yuvaraj.patil@wipro.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ti-utils/ti-utils.mk

@@ -13,7 +13,7 @@ TI_UTILS_LICENSE_FILES = COPYING
 define TI_UTILS_BUILD_CMDS
 	$(MAKE1) NFSROOT="$(STAGING_DIR)" \
 		CC="$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) -I$(STAGING_DIR)/usr/include/libnl3" \
-		LIBS="-lnl-3 -lnl-genl-3 -lm" -C $(@D) all
+		LIBS="-lnl-3 -lnl-genl-3 -lpthread -lm" -C $(@D) all
 endef
 
 define TI_UTILS_INSTALL_TARGET_CMDS