patch 8.1.0869: Travis CI script is too complicated

Problem:    Travis CI script is too complicated.
Solution:   Add names to environments.  Move appveyor script outside of src
            directory. (Ozaki Kiichi, closes #3890)
diff --git a/appveyor.yml b/appveyor.yml
index bdeb162..2d88bed 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,7 +19,7 @@
   - 'set INCLUDE=%INCLUDE%C:\Program Files (x86)\Windows Kits\8.1\Include\um'
 
 build_script:
-  - src/appveyor.bat
+  - ci/appveyor.bat
 
 test_script:
   - cd src/testdir