api: Add check for Crypto inclusion to context class

include/uvgrtp/lib.hh

@@ -81,6 +81,8 @@ namespace uvgrtp {
             std::string& get_cname();
             /// \endcond
 
+            bool crypto_enabled() const;
+
         private:
             /* Generate CNAME for participant using host and login names */
             std::string generate_cname();

src/lib.cc

@@ -78,3 +78,8 @@ std::string& uvgrtp::context::get_cname()
 {
     return cname_;
 }
+
+bool uvgrtp::context::crypto_enabled() const
+{
+    return uvgrtp::crypto::enabled();
+}