[fix] Emulate shell path expansion for exec

execv doesn't search the path for binaries, making it harder to execute
commands. execvp can be used instead.

src/argo_nodeos_config.cpp

@@ -773,7 +773,7 @@ int main(int argc, char** argv)
 	/* We perform the execve(2) after all the cleanup is done.  */
 	if (exec_argv)
 	{
-	    execv(exec_argv[0], exec_argv);
+	    execvp(exec_argv[0], exec_argv);
 	    argo_exit(EXIT_FAILURE, "Command execution failed", errno);
 	}