Turn build section of Appveyor build off

Hopefully avoid "Specify which project or solution file to use
because the folder contains more than one project or solution file."
error.

Author: samcv

.appveyor.yml

@@ -23,7 +23,7 @@ branches:
     - master
     - appveyor
 
-#build: off
+build: off
 
 test_script:
 #  - cd %APPVEYOR_BUILD_FOLDER%\nqp