added jwt-cpp in project directory

src/libs/jwt-cpp-0.7.0/tests/cmake/libressl-is-used.cpp

@@ -0,0 +1,13 @@
+#if !__has_include(<tls.h>)
+#error "missing LibreSSL's TLS header!"
+#endif
+
+#include <tls.h>
+
+#include "jwt-cpp/jwt.h"
+
+int main() {
+	tls_init();
+	jwt::date date;
+	return 0;
+}