Delete stray test

library/compiler-builtins/libm/src/math/acosf.rs

@@ -74,17 +74,3 @@ pub fn acosf(x: f32) -> f32 {
     w = r(z) * s + c;
     2. * (df + w)
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn acosf() {
-        extern {
-            fn acosf(x: f32) -> f32;
-        }
-        unsafe {
-            crate::_eqf(super::acosf(1.0), acosf(1.0)).unwrap();
-        }
-    }
-    // shared::f32!("musl", acosf);
-}