We only want the base lib to be built, not all tests

It might sound crazy, but we're not running the tests. We're just checking that nothing extra shows up with the very limited ARM target of the GBA (armv4tdmi).

Author: Lokathor

.travis.yml

@@ -85,7 +85,7 @@ matrix:
         - cd ..
         # Pull the target spec up into the current directory and then build
         - mv ci/gba.json gba.json
-        - xargo build --all --target=gba.json
+        - xargo build --lib --target=gba.json
     - name: "Documentation"
       install: true
       script: ci/dox.sh