[ci skip] Changed AppVeyor build settings to produce Windows XP-compa…

…tible dev builds.

appveyor.yml

@@ -15,20 +15,22 @@ matrix:
   fast_finish: true
 
 environment:
-  PlatformToolset: v140
   matrix:
   - configuration: Release
     platform: Win32
     bin_dir: bin32
     artifact_suffix: -Win32
+    PlatformToolset: v100
   - configuration: Release-SSE2
     platform: Win32
     bin_dir: bin32
     artifact_suffix: -Win32-sse2
+    PlatformToolset: v100
   - configuration: Release
     platform: x64
     bin_dir: bin64
     artifact_suffix: -Win64
+    PlatformToolset: v140
 
 before_build:
 - ps: |
@@ -72,7 +74,13 @@ deploy:
 - provider: GitHub
   tag: $(pov_version)
   release: Development build $(pov_version)
-  description: '**Note:** This is a binary-only development release; to install, copy the binary into an existing POV-Ray 3.7 installation. (Make sure to backup the original binary first.)'
+  description: |-
+    **Note:** This is a binary-only development release; to install, copy the binary into an existing POV-Ray 3.7
+    installation. (Make sure to backup the original binary first.)
+    
+    **Note:** The 64-bit binary may require Windows Vista or higher. To run this development release on an earlier
+    64-bit version of Windows, you may need to use the 32-bit SSE2 binary instead.
+
   auth_token:
     secure: WkcFPXyr/SJ9TXixTQyivhfoR9FzlryIbc4deHeQ0eA6YRXL0wQopMYJ6XL1/FJK
   draft: true