Fix alga cfg gate for some quickcheck tests.

tests/core/conversion.rs

@@ -1,4 +1,4 @@
-#![cfg(feature = "arbitrary")]
+#![cfg(all(feature = "arbitrary", feature = "alga"))]
 use alga::linear::Transformation;
 use na::{
     self, Affine3, Isometry3, Matrix2, Matrix2x3, Matrix2x4, Matrix2x5, Matrix2x6, Matrix3,

tests/core/matrix.rs

@@ -945,7 +945,7 @@ mod normalization_tests {
     }
 }
 
-#[cfg(feature = "arbitrary")]
+#[cfg(all(feature = "arbitrary", feature = "alga"))]
 // FIXME: move this to alga ?
 mod finite_dim_inner_space_tests {
     use super::*;