Tuning test

.travis.yml

@@ -17,7 +17,7 @@ matrix:
       script: make mg_prefix
     - os: linux
       compiler: clang
-      script: cat  /usr/include/mbedtls/version.h ; grep -r mbedtls_net_send /usr/include/mbedtls/
+      script: cat  /usr/include/mbedtls/net.h ; grep -r mbedtls_net_send /usr/include/mbedtls/
     - os: linux
       compiler: msvc98
       script: make vc98 vc2017

mongoose.c

@@ -2924,8 +2924,10 @@ void mg_timer_poll(unsigned long now_ms) {
 #include <mbedtls/debug.h>
 #include <mbedtls/ssl.h>
 #include <mbedtls/version.h>
-#if MBEDTLS_VERSION_MINOR > 22
+#if MBEDTLS_VERSION_NUMBER > 0x02070000
 #include <mbedtls/net_sockets.h>
+#else
+#include <mbedtls/net.h>
 #endif
 
 struct mg_tls {