mosquitto: supports only the real OpenSSL, not LibreSSL

mosquitto will not build with LibreSSL without patches, so let's
support only OpenSSL.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/mosquitto/mosquitto.mk

@@ -30,8 +30,8 @@ else
 MOSQUITTO_MAKE_OPTS += WITH_THREADING=no
 endif
 
-ifeq ($(BR2_PACKAGE_OPENSSL),y)
-MOSQUITTO_DEPENDENCIES += openssl
+ifeq ($(BR2_PACKAGE_LIBOPENSSL),y)
+MOSQUITTO_DEPENDENCIES += libopenssl
 MOSQUITTO_MAKE_OPTS += WITH_TLS=yes
 else
 MOSQUITTO_MAKE_OPTS += WITH_TLS=no