Fix MSVC builds / update to Qt 5.9.9 (patched)

.appveyor.yml

@@ -4,7 +4,7 @@ clone_folder: C:\MuseScore
 # set clone depth
 clone_depth: 50                      # clone entire repository history if not defined
 
-image: Previous Visual Studio 2019
+image: Visual Studio 2019
 
 branches:
   only:
@@ -14,8 +14,8 @@ branches:
 # build cache to preserve files/folders between builds
 cache:
   - dependencies.7z
-  - qt598_msvc2017_64.7z # if not using AppVeyor's built-in Qt in before_build.bat
-  - qt598_msvc2015.7z # if not using AppVeyor's built-in Qt in before_build.bat
+  - qt599_msvc2017_64.7z # if not using AppVeyor's built-in Qt in before_build.bat
+  - qt599_msvc2015.7z # if not using AppVeyor's built-in Qt in before_build.bat
   - C:\Program Files (x86)\Jack
   - C:\MuseScore\build.release\thirdparty
   - C:\ccache

build/appveyor/before_build.bat

@@ -2,15 +2,15 @@
 IF "%PLATFORM%" == "x64" (
   SET "QTURL=https://utils.musescore.org.s3.amazonaws.com/qt598_msvc2017_64.7z"
   SET "QTDIR=%cd%\qt\msvc2017_64" & :: uncomment to use our Qt
-  SET "QTCACHE=qt598_msvc2017_64.7z" & :: bump version here and .appveyor.yml to trigger cache rebuild when upgrading Qt
-  :: SET "QTDIR=C:\Qt\5.12.4\msvc2017_64" & :: uncomment to use AppVeyor's Qt
+  SET "QTCACHE=qt599_msvc2017_64.7z" & :: bump version here and .appveyor.yml to trigger cache rebuild when upgrading Qt
+  :: SET "QTDIR=C:\Qt\5.12.9\msvc2017_64" & :: uncomment to use AppVeyor's Qt
   SET "TARGET_PROCESSOR_BITS=64"
   SET "TARGET_PROCESSOR_ARCH=x86_64"
 ) ELSE (
   SET "QTURL=https://utils.musescore.org.s3.amazonaws.com/qt598_msvc2015.7z"
   SET "QTDIR=%cd%\qt\msvc2015" & :: uncomment to use our Qt
-  SET "QTCACHE=qt598_msvc2015.7z" & :: bump version here and .appveyor.yml to trigger cache rebuild when upgrading Qt
-  :: SET "QTDIR=C:\Qt\5.12.4\msvc2017" & :: uncomment to use AppVeyor's Qt
+  SET "QTCACHE=qt599_msvc2015.7z" & :: bump version here and .appveyor.yml to trigger cache rebuild when upgrading Qt
+  :: SET "QTDIR=C:\Qt\5.12.9\msvc2017" & :: uncomment to use AppVeyor's Qt
   SET "TARGET_PROCESSOR_BITS=32"
   SET "TARGET_PROCESSOR_ARCH=x86"
 )