meson: save git_version.xml to meson build directory in version.ps1

tools/version.ps1

@@ -28,7 +28,7 @@ if ([System.IO.Path]::GetFullPath([System.IO.Path]::Combine((pwd).Path, $BuildRo
     $BuildRoot = Join-Path $repositoryRootPath 'build'
   }
 $gitVersionHeaderPath = Join-Path $BuildRoot 'git_version.h'
-$gitVersionXmlPath = Join-Path $repositoryRootPath 'build' | Join-Path -ChildPath 'git_version.xml'
+$gitVersionXmlPath = Join-Path $BuildRoot 'git_version.xml'
 
 $version = @{}
 if (Test-Path $gitVersionHeaderPath) {