For CI - still exclude tool building for PR build on AppVeyor.

Unlike Travis, initial build for PR on AppVeyor does not inherit cache from the master branch, thus exclude the tool for faster build time.

.appveyor.yml

@@ -64,6 +64,7 @@ before_build:
   - ps: $env:COMMIT_MESSAGE = $(git log --format=%B -n 1 $env:APPVEYOR_REPO_COMMIT)
   - rake ci_setup_cache
 build_script:
+  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER) { $env:URHO3D_TOOLS = "0" }
   - rake ci && if "%PACKAGE_UPLOAD%" == "1" rake ci_package_upload && move Build\*.zip . && rd /S /Q Build\_CPack_Packages
   - rake ci_timer
 after_build: rake ci_teardown_cache

Rakefile

@@ -449,7 +449,7 @@ desc 'Teardown build cache'
 task :ci_teardown_cache do
   # AppVeyor on Windows host has different kind of cache mechanism, not based on ccache
   if ENV['APPVEYOR']
-    # No-op for now
+    system "bash -c 'rm -rf #{ENV['build_tree']}/{bin,Source/Urho3D/tolua++-prefix/src/tolua++-build/bin}'"
     next
   # Upload cache to internal cache store if it is our own
   elsif ENV['USE_CCACHE'].to_i == 2