Changes the verbosity of msbuild from quiet to normal in the appveyor script. Increasing the verbosity helps to identify the cause of build errors which is the main purpose of the appveyor script.

.appveyor.yml

@@ -33,7 +33,7 @@ before_build:
 - ps:  Start-Process clcache-server
 - ps:  fsutil behavior set disablelastaccess 0 # Enable Access time feature on Windows (for clcache)
 build_script:
-- cmd: msbuild /p:TrackFileAccess=false /p:CLToolExe=clcache.exe build_msvc\bitcoin.sln /m /v:q /nologo
+- cmd: msbuild /p:TrackFileAccess=false /p:CLToolExe=clcache.exe build_msvc\bitcoin.sln /m /v:n /nologo
 after_build:
 - ps:  fsutil behavior set disablelastaccess 1 # Disable Access time feature on Windows (better performance)
 - ps:  clcache -z