Compile test_num_f128 conditionally on reliable_f128_math configuration

Author: raoulstrackx

library/std/src/f128/tests.rs

@@ -2,7 +2,9 @@
 #![cfg(reliable_f128)]
 
 use crate::f128::consts;
-use crate::num::{FpCategory as Fp, *};
+#[cfg(not(reliable_f128))]
+use crate::num::*;
+use crate::num::FpCategory as Fp;
 
 // Note these tolerances make sense around zero, but not for more extreme exponents.
 
@@ -52,6 +54,7 @@ macro_rules! assert_f128_biteq {
 }
 
 #[test]
+#[cfg(reliable_f128_math)]
 fn test_num_f128() {
     test_num(10f128, 2f128);
 }