OpenSSL: Add CONFIG_TLS_ADD_DL=y build option for hostapd

This behaves similarly to the same option in wpa_supplicant, i.e., adds
-ldl when linking in libcrypto from OpenSSL.

Signed-off-by: Jouni Malinen <j@w1.fi>

hostapd/Makefile

@@ -545,6 +545,10 @@ NEED_SHA256=y
 NEED_TLS_PRF_SHA256=y
 LIBS += -lcrypto
 LIBS_h += -lcrypto
+ifdef CONFIG_TLS_ADD_DL
+LIBS += -ldl
+LIBS_h += -ldl
+endif
 endif
 
 ifeq ($(CONFIG_TLS), gnutls)