Fix hlr_auc_gw build with OpenSSL

Commit 983c6a606bc839248ea0c69090e60c095a655bc6 ('OpenSSL: Replace
internal HMAC-MD5 implementation') forgot to make inclusion of md5.o
conditional for hlr_auc_gw build.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
2 files changed