appveyor: drop support for VS2008

- Visual Studio 2008 has been dropped
  by EPICS Base end of 2020
(fixes #64)

Author: ralphlange

.appveyor.yml

@@ -95,7 +95,6 @@ environment:
   - CMP: vs2013
   - CMP: vs2012
   - CMP: vs2010
-  - CMP: vs2008
 
 # Platform: architecture
 platform:
@@ -125,8 +124,6 @@ matrix:
     CMP: vs2012
   - platform: x64
     CMP: vs2010
-  - platform: x64
-    CMP: vs2008
 
 # Run test script for unit tests (SET = test00)
 for:

README.md

@@ -85,7 +85,7 @@ for more details.
  - One parallel runner (all builds are sequential)
  - Windows Server 2012/2016/2019
  - Compile using gcc/MinGW or different Visual Studio versions: \
-   2008, 2010, 2012, 2013, 2015, 2017, 2019
+   2010, 2012, 2013, 2015, 2017, 2019
  - Compile for Windows 32bit and 64bit
  - No useful caching available.
 

appveyor/.appveyor.yml.example-full

@@ -109,7 +109,6 @@ environment:
   - CMP: vs2013
   - CMP: vs2012
   - CMP: vs2010
-  - CMP: vs2008
 
 # Platform: processor architecture
 platform:
@@ -124,8 +123,6 @@ matrix:
     CMP: vs2012
   - platform: x64
     CMP: vs2010
-  - platform: x64
-    CMP: vs2008
   # Exclude more jobs to reduce build time
   # E.g., skip 32-bit for newer compilers
   #- platform: x86

appveyor/.appveyor.yml.example-mini

@@ -52,8 +52,6 @@ matrix:
     CMP: vs2012
   - platform: x64
     CMP: vs2010
-  - platform: x64
-    CMP: vs2008
 
 build_script:
   - cmd: python .ci/cue.py prepare

appveyor/README.md

@@ -5,7 +5,7 @@
  - One parallel runner (all builds are sequential)
  - Windows Server 2012/2016/2019
  - Compile using gcc/MinGW or different Visual Studio versions: \
-   2008, 2010, 2012, 2013, 2015, 2017, 2019
+   2010, 2012, 2013, 2015, 2017, 2019
  - Compile for Windows 32bit and 64bit
  - No useful caching available.
 
@@ -46,7 +46,7 @@
     List of environment variable settings. Each list element (starting with
     a dash) is one step on the axis of the build matrix. \
     Set `CMP` to select the compiler: `gcc` for the native
-    [MinGW](http://mingw-w64.org/) GNU compiler, `vs2008` ...`vs2019` 
+    [MinGW](http://mingw-w64.org/) GNU compiler, `vs2010` ...`vs2019` 
     (options listed above) for the Microsoft Visual Studio compilers.
 
     Your builds will take long. \