Remove Visual Studio 9 2008 from AppVeyor CI

Author: martinmoene

appveyor.yml

@@ -32,7 +32,6 @@ environment:
         - generator: "Visual Studio 12 2013"
         - generator: "Visual Studio 11 2012"
         - generator: "Visual Studio 10 2010"
-        - generator: "Visual Studio 9 2008"
 
 matrix:
     exclude:
@@ -48,8 +47,6 @@ matrix:
           generator: "Visual Studio 11 2012"
         - image:      Visual Studio 2019
           generator: "Visual Studio 10 2010"
-        - image:      Visual Studio 2019
-          generator: "Visual Studio 9 2008"
         - image:      Visual Studio 2015
           generator: "Visual Studio 15 2017"
         - image:      Visual Studio 2017
@@ -62,14 +59,6 @@ matrix:
           generator: "Visual Studio 11 2012"
         - image:      Visual Studio 2017
           generator: "Visual Studio 10 2010"
-        - image:      Visual Studio 2017
-          generator: "Visual Studio 9 2008"
-        - image:      Visual Studio 2015
-          platform:   x64
-          generator: "Visual Studio 9 2008"
-        - image:      Visual Studio 2019
-          platform:   x64
-          generator: "Visual Studio 9 2008"
 
 before_build:
     - mkdir build && cd build