Build winarm64 clang with host clang instead of gcc

Author: BtbN

images/base-winarm64/Dockerfile

@@ -3,7 +3,7 @@ FROM $GH_REPO/base:latest
 
 RUN \
     git clone --filter=blob:none https://github.com/mstorsjo/llvm-mingw /llvm-mingw && cd /llvm-mingw && \
-    ./build-all.sh --disable-lldb --disable-lldb-mi /opt/llvm-mingw && \
+    ./build-all.sh --with-clang --disable-lldb --disable-lldb-mi /opt/llvm-mingw && \
     cd / && \
     rm -rf llvm-mingw