Provisioning: Install libClang 10 with dynamic libs

As Qt uses only static archives of libclang, we have to install
dynamic version as an additional package. Libclang is required
for example QtForPython.

Change-Id: Ic9d70398113defe3561f261aee369b423c18686a
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>
(cherry picked from commit b792fd56db)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

coin/provisioning/common/windows/libclang-v100-dyn.ps1

@@ -0,0 +1,50 @@
+param(
+    [Int32]$archVer=32,
+    [string]$toolchain="vs2019",
+    [bool]$setDefault=$true
+)
+. "$PSScriptRoot\helpers.ps1"
+
+$libclang_version="10.0"
+Write-Output "libClang for QtForPython = $libclang_version" >> ~/versions.txt
+
+# PySide versions following Qt6 use a C++ parser based on Clang (http://clang.org/).
+# The Clang library (C-bindings), version 8.0 or higher is required for building.
+
+# Starting from Qt 5.11 QDoc requires Clang to parse C++
+
+$baseDestination = "C:\Utils\libclang-" + $libclang_version + "-dynlibs-" + $toolchain
+$libclang_version = $libclang_version -replace '["."]'
+
+function install() {
+
+    param(
+        [string]$sha1=$1,
+        [string]$destination=$2
+    )
+
+    $zip = "c:\users\qt\downloads\libclang-dyn.7z"
+
+    $script:OfficialUrl = "https://download.qt.io/development_releases/prebuilt/libclang/libclang-release_$libclang_version-based-windows-$toolchain`_$archVer.7z"
+    $script:CachedUrl = "http://ci-files01-hki.intra.qt.io/input/libclang/libclang-release_$libclang_version-based-windows-$toolchain`_$archVer.7z"
+
+    Download $OfficialUrl $CachedUrl $zip
+    Verify-Checksum $zip $sha1
+    Extract-7Zip $zip C:\Utils\
+    Rename-Item C:\Utils\libclang $destination
+    Remove-Item -Force -Path $zip
+}
+
+if ( $toolchain -eq "vs2019" ) {
+    if ( $archVer -eq 64 ) {
+        $sha1 = "B2C4F24B2388AEBAA6B8FCE3AE4E63D34D1517FE"
+    }
+    else {
+        $sha1 = "b970f51df255a27e0fdb7b665e70ed5281257f40"
+    }
+}
+
+install $sha1 $baseDestination-$archVer
+
+Set-EnvironmentVariable "LLVM_DYNAMIC_LIBS_100" ($baseDestination + "-_ARCH_")
+