Add external projects to Travis CI jobs

Small tests like the ones included in this repository are good to test
individual features, but it is also a good idea to test some real
projects.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

.travis.yml

@@ -2,14 +2,12 @@ language: c
 sudo: required
 install:
   - ./.travis-deps.sh
+  - make
+  - sudo make install
 os:
   - linux
 compiler:
   - clang
   - gcc
 script:
-  - make
-  - sudo make install
-after_success:
-  - pushd test/asm/ && ./test.sh && popd
-  - pushd test/link/ && ./test.sh && popd
+  - ./test/run-tests.sh