travis: experiment to move apt addons under stage

.travis.yml

@@ -1,24 +1,6 @@
 language: c
 compiler: gcc
 sudo: false
-addons:
-  apt:
-    packages:
-      - mingw-w64-i686-dev
-      - binutils-mingw-w64-i686
-      - gcc-mingw-w64-i686
-      - g++-mingw-w64-i686
-      - p7zip-full
-      - gcc-multilib
-      - g++-multilib
-      - libx11-dev:i386
-      - libxext-dev:i386
-      - x11-utils
-      - libgl1-mesa-dev
-      - libasound-dev
-      - zlib1g:i386
-      - libstdc++6:i386
-      - libfuse2:i386
 env:
   global:
     - SDL_VERSION=2.0.8
@@ -46,6 +28,24 @@ jobs:
       cache: ccache
       os: linux
       dist: xenial
+      addons:
+        apt:
+          packages:
+            - mingw-w64-i686-dev
+            - binutils-mingw-w64-i686
+            - gcc-mingw-w64-i686
+            - g++-mingw-w64-i686
+            - p7zip-full
+            - gcc-multilib
+            - g++-multilib
+            - libx11-dev:i386
+            - libxext-dev:i386
+            - x11-utils
+            - libgl1-mesa-dev
+            - libasound-dev
+            - zlib1g:i386
+            - libstdc++6:i386
+            - libfuse2:i386
       before_script:
         - sh scripts/travis_common_deps.sh
         - sh scripts/travis_${TRAVIS_OS_NAME}_deps.sh