Skip #[cfg(test)] and mod tests, not needed

tests/stress.rs

@@ -4467,10 +4467,6 @@ unsafe fn stress_functions(context: &dc_context_t) {
     };
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
 unsafe extern "C" fn cb(
     _context: &dc_context_t,
     _event: Event,
@@ -4503,4 +4499,3 @@ mod tests {
         stress_functions(&ctx);
     }
 }
-}