Travis: Modify script for new unit test directory

.travis.yml

@@ -73,7 +73,7 @@ before_script:
   - if [[ "${BUILD_TYPE}" == "OSX_OPENSSL_1_1" ]]; then HOMEBREW_NO_AUTO_UPDATE=1 brew install openssl@1.1 ;fi
   # Generate the build scripts with CMake
   - mkdir output
-  - gcc test/cgi_test.c -o output/cgi_test.cgi
+  - gcc unittest/cgi_test.c -o output/cgi_test.cgi
   - cd output
   - cmake --version
   - cmake