Try running appveyor tests without explicit target flag

Author: fuine

appveyor.yml

@@ -50,10 +50,10 @@ install:
 build: false
 
 test_script:
-  - cargo build --verbose --target %TARGET%
-  - cargo test --target %TARGET%
+  - cargo build --verbose
+  - cargo test
   - if [%CHANNEL%]==[nightly] (
       cargo clean &&
-      cargo build --verbose --target %TARGET% --features "compiletest" &&
-      cargo test --target %TARGET% --features "compiletest"
+      cargo build --verbose --features "compiletest" &&
+      cargo test --features "compiletest"
     )