Make options configurable for HMAC_DRBG
diff --git a/include/polarssl/hmac_drbg.h b/include/polarssl/hmac_drbg.h
index 36d1200..79be0a6 100644
--- a/include/polarssl/hmac_drbg.h
+++ b/include/polarssl/hmac_drbg.h
@@ -37,10 +37,12 @@
#define POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG -0x0038 /**< Input too large (Entropy + additional). */
#define POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR -0x003A /**< Read/write error in file. */
+#if !defined(POLARSSL_CONFIG_OPTIONS)
#define POLARSSL_HMAC_DRBG_RESEED_INTERVAL 10000 /**< Interval before reseed is performed by default */
#define POLARSSL_HMAC_DRBG_MAX_INPUT 256 /**< Maximum number of additional input bytes */
#define POLARSSL_HMAC_DRBG_MAX_REQUEST 1024 /**< Maximum number of requested bytes per call */
#define POLARSSL_HMAC_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */
+#endif /* !POLARSSL_CONFIG_OPTIONS */
#define POLARSSL_HMAC_DRBG_PR_OFF 0 /**< No prediction resistance */
#define POLARSSL_HMAC_DRBG_PR_ON 1 /**< Prediction resistance enabled */