Don't use relative qt path.

.github/workflows/main.yml

@@ -86,7 +86,7 @@ jobs:
         call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
         cd build
         set PATH=%PATH%;C:\Program Files (x86)\WiX Toolset v3.11\bin;%CD%
-        cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DCMAKE_MAKE_PROGRAM=ninja.exe -DQTROOT=Qt/5.15.2/msvc2019_64 -DMPV_INCLUDE_DIR=mpv/include -DMPV_LIBRARY=mpv/mpv.dll -DCMAKE_INSTALL_PREFIX=output ..
+        cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DCMAKE_MAKE_PROGRAM=ninja.exe -DQTROOT=D:/a/jellyfin-media-player/jellyfin-media-player/Qt/5.15.2/msvc2019_64 -DMPV_INCLUDE_DIR=mpv/include -DMPV_LIBRARY=mpv/mpv.dll -DCMAKE_INSTALL_PREFIX=output ..
         lib /def:mpv\mpv.def /out:mpv\mpv.dll.lib /MACHINE:X64
         ninja
         ninja windows_package