Add an OpenBLAS feature

src/standalone.rs

@@ -100,3 +100,14 @@ impl Default for SystemInfo {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_openblas() {
+        let info = SystemInfo::default();
+        assert_eq!(info.blas, cfg!(feature = "openblas"));
+    }
+}