Made headers compatible with C++.

inc/bearssl_ssl.h

@@ -35,6 +35,10 @@
 #include "bearssl_rand.h"
 #include "bearssl_x509.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** \file bearssl_ssl.h
  *
  * # SSL
@@ -4065,4 +4069,8 @@ int br_sslio_close(br_sslio_context *cc);
 #define BR_ALERT_UNSUPPORTED_EXTENSION     110
 #define BR_ALERT_NO_APPLICATION_PROTOCOL   120
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif