Try to fix AppVeyor Windows builds

 By working around Manishearth/compiletest-rs#81

Signed-off-by: Mohammad AlSaleh <[email protected]>

Author: MoSal

tests/compiletest.rs

@@ -9,7 +9,9 @@ fn run_mode(mode: &'static str) {
 
     config.mode = mode.parse().expect("Invalid mode");
     config.src_base = PathBuf::from(format!("tests/{}", mode));
-    config.link_deps(); // Populate config.target_rustcflags with dependencies on the path
+    // Try populating rustflags directly to avoid compiletest-rs #81
+    // config.link_deps(); // Populate config.target_rustcflags with dependencies on the path
+    config.target_rustcflags = Some("-L target/debug".to_string());
     config.clean_rmeta(); // If your tests import the parent crate, this helps with E0464
 
     compiletest::run_tests(&config);