Disable SRTP by default

Disable `MBEDTLS_SSL_DTLS_SRTP` by default in the configuration file.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index cd7c073..7a1a2b1 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1822,9 +1822,9 @@
  *
  * Requires: MBEDTLS_SSL_PROTO_DTLS
  *
- * Comment this to disable support for DTLS-SRTP.
+ * Uncomment this to enable support for use_srtp extension.
  */
-#define MBEDTLS_SSL_DTLS_SRTP
+//#define MBEDTLS_SSL_DTLS_SRTP
 
 /**
  * \def MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE