Skip x86 development on appveyor in a cleaner way

scripts/appveyor.yml

@@ -24,14 +24,8 @@ environment:
   coverity_email:
     secure: ndq7n9R6NhCV8mENhPAH4VTFNUeROGK/uFlqfUVwxAc=
 
-# Can't exclude things in the build matrix, just skip development win32
-matrix:
-  allow_failures:
-    - configuration: Development
-      platform: x86
-
 init:
-  - if "%PLATFORM%" EQU "x86" ( if "%CONFIGURATION%"=="Development" (echo "Skipping x86 Development" && exit /b 1 ) )
+  - if "%PLATFORM%" EQU "x86" ( if "%CONFIGURATION%"=="Development" (echo "Skipping x86 Development" && appveyor exit ) )
 
 install:
 - ps: $env:PATH = 'C:\MinGW\bin;C:\MinGW\mingw32\bin;C:\MinGW\msys\1.0\bin;' + $env:PATH