Flip polarity again

Author: tgross35

src/macros.rs

@@ -199,7 +199,7 @@ macro_rules! e {
 // cfg completely.
 // FIXME(ctest): ctest can't handle `$(,)?` so we use `$(,)*` which isn't quite correct.
 cfg_if! {
-    if #[cfg(not(libc_ctest))] {
+    if #[cfg(libc_ctest)] {
         /// Define an `unsafe` function that is not const for `ctest`
         macro_rules! f {
             ($(