Fix compilation errors

Fix compilation errors when `MBEDTLS_DTLS_SRTP` not set
1. Add file missed in previous commmit.
2. In sample applications, set `DFL_FORCE_SRTP_PROFILE` to 0.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 2db5887..137838c 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -184,7 +184,7 @@
 #define DFL_NSS_KEYLOG_FILE     NULL
 #define DFL_QUERY_CONFIG_MODE   0
 #define DFL_USE_SRTP            0
-#define DFL_SRTP_FORCE_PROFILE  MBEDTLS_SRTP_UNSET_PROFILE
+#define DFL_SRTP_FORCE_PROFILE  0
 #define DFL_SRTP_SUPPORT_MKI    0
 
 #define LONG_RESPONSE "<p>01-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n" \