ccpwinrt: There is no Windows SDK on clangarm64 CI

mingw-w64-cppwinrt/PKGBUILD

@@ -4,10 +4,10 @@ _realname=cppwinrt
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=2.0.230706.1
-pkgrel=2
+pkgrel=3
 pkgdesc="C++ language projection for Windows Runtime (WinRT) APIs (mingw-w64)"
 arch=('any')
-mingw_arch=('ucrt64' 'clang64' 'clang32' 'clangarm64')
+mingw_arch=('ucrt64' 'clang64' 'clangarm64')
 url='https://aka.ms/cppwinrt'
 license=('spdx:MIT')
 depends=("${MINGW_PACKAGE_PREFIX}-gcc-libs")
@@ -53,10 +53,12 @@ package() {
 
   install -Dm755 cppwinrt.exe "${pkgdir}${MINGW_PREFIX}/bin/cppwinrt.exe"
 
-  # Install C++/WinRT Headers
-  ./cppwinrt.exe -input "10.0.22621.0"
-  mkdir -p "${pkgdir}${MINGW_PREFIX}/include"
-  cp -r winrt "${pkgdir}${MINGW_PREFIX}/include/"
+  # Generate & Install C++/WinRT Headers
+  if [[ ${CARCH} == x86_64 ]]; then
+    ./cppwinrt.exe -input "10.0.22621.0"
+    mkdir -p "${pkgdir}${MINGW_PREFIX}/include"
+    cp -r winrt "${pkgdir}${MINGW_PREFIX}/include/"
+  fi
 
   install -Dm644 "${srcdir}/${_realname}-${pkgver}/LICENSE" "${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}/LICENSE"
 }