CI: Build the module dynamically as well

.travis.yml

@@ -5,12 +5,15 @@ compiler:
   - gcc
 
 env:
-  # At least try stable and mainline versions
-  - NGINX=1.10.0 TYPE=dynamic
-  - NGINX=1.9.15 TYPE=dynamic
-  - NGINX=1.8.1 TYPE=static
+  # Mainline
   - NGINX=1.11.3
-  - NGINX=1.9.11
+  - NGINX=1.11.3  DYNAMIC=1
+  # Stable
+  - NGINX=1.10.1
+  - NGINX=1.10.1  DYNAMIC=1
+  # Other configurations
+  - NGINX=1.9.15
+  - NGINX=1.9.15  DYNAMIC=1
   - NGINX=1.8.1
   # Also, the oldest supported version
   # TODO: Fails building because it won't find IOV_MAX from header.
@@ -29,5 +32,5 @@ cache: ccache
 script: |
   wget -O - http://nginx.org/download/nginx-${NGINX}.tar.gz | tar -xzf -
   cd nginx-${NGINX}
-  if [[ ${TYPE} = "dynamic" ]] ; then ./configure --add-dynamic-module=.. --with-http_addition_module ; else ./configure --add-module=.. --with-http_addition_module ; fi
+  ./configure --add-${DYNAMIC:+dynamic-}module=.. --with-http_addition_module
   make