package/stress-ng: add libbsd optional dependency

stress-ng optionally detects and uses BSD wcsl* wchar string functions.

Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/stress-ng/stress-ng.mk

@@ -12,6 +12,10 @@ STRESS_NG_LICENSE_FILES = COPYING
 
 STRESS_NG_DEPENDENCIES = attr keyutils
 
+ifeq ($(BR2_PACKAGE_LIBBSD),y)
+STRESS_NG_DEPENDENCIES += libbsd
+endif
+
 define STRESS_NG_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)
 endef