appveyor: Move msys2-mingw matrix a little higher

Allows us to see failures in it sooner because it will be run earlier

.appveyor.yml

@@ -20,6 +20,10 @@ environment:
       compiler: msvc2015
       backend: vs2015
 
+    - arch: x86
+      compiler: msys2-mingw
+      backend: ninja
+
     - arch: x64
       compiler: msvc2017
       backend: ninja
@@ -30,10 +34,6 @@ environment:
       backend: vs2017
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
 
-    - arch: x86
-      compiler: msys2-mingw
-      backend: ninja
-
     - arch: x64
       compiler: msys2-mingw
       backend: ninja