Give up VC2008 on appveyor

appveyor.yml

@@ -7,12 +7,10 @@ configuration:
 
 environment:
   matrix:
-  - VS_VERSION: 9 2008
-    VS_PLATFORM: win32
-    VS_VAR: C:\Program Files\Microsoft Visual Studio 9\VC\Vcvarsall.bat
-  - VS_VERSION: 9 2008
-    VS_PLATFORM: x64
-    VS_VAR: C:\Program Files\Microsoft Visual Studio 9\VC\Vcvarsall.bat
+  # - VS_VERSION: 9 2008
+  #   VS_PLATFORM: win32
+  # - VS_VERSION: 9 2008
+  #   VS_PLATFORM: x64
   - VS_VERSION: 10 2010
     VS_PLATFORM: win32
   - VS_VERSION: 10 2010
@@ -32,7 +30,6 @@ environment:
 
 before_build:
 - git submodule update --init --recursive
-- if defined VS_VAR call "%VS_VAR%"
 - cmake -H. -BBuild/VS -G "Visual Studio %VS_VERSION%" -DCMAKE_GENERATOR_PLATFORM=%VS_PLATFORM% -DBUILD_SHARED_LIBS=true -Wno-dev
 
 build: