install-wrappers: Pass --config-system-dir in the --host-clang mode

This is required since e2e9216853
for this configuration to be able to find the config files.

Also add the *.cfg files to the Dockerfile COPY line.

Dockerfile.system-clang

@@ -32,7 +32,7 @@ ARG DEFAULT_CRT=ucrt
 ARG CFGUARD_ARGS=--enable-cfguard
 
 COPY build-all.sh build-llvm.sh install-wrappers.sh build-mingw-w64.sh build-mingw-w64-tools.sh build-compiler-rt.sh build-libcxx.sh build-mingw-w64-libraries.sh build-openmp.sh ./
-COPY wrappers/*.sh wrappers/*.c wrappers/*.h ./wrappers/
+COPY wrappers/*.sh wrappers/*.c wrappers/*.h wrappers/*.cfg ./wrappers/
 # Libcxx version 17 requires Clang >= 15, while Libcxx 18 requires Clang >= 16.
 RUN LLVM_VERSION=llvmorg-17.0.6 ./build-all.sh $TOOLCHAIN_PREFIX --host-clang=clang-15 && \
     rm -rf /build/*

install-wrappers.sh

@@ -84,7 +84,7 @@ if [ -n "${HOST_CLANG}" ]; then
 
     # Note: clang will detect the "InstalledDir" based on the path that was used to invoke the tools
     # This might still have some hidden effects
-    printf '#!/bin/sh\nsr=$(dirname "$(dirname "$(readlink -f "$0")")")\nexec %s -resource-dir="$sr"%s --sysroot="$sr" "$@"\n' "$HOST_CLANG_EXE" "$clangres" > $PREFIX/bin/clang
+    printf '#!/bin/sh\nsr=$(dirname "$(dirname "$(readlink -f "$0")")")\nexec %s -resource-dir="$sr"%s --sysroot="$sr" --config-system-dir="$sr"/bin "$@"\n' "$HOST_CLANG_EXE" "$clangres" > $PREFIX/bin/clang
     # printf '#!/bin/sh\nsr=$(dirname "$(dirname "$(readlink -f "$0")")")\nexec %s -resource-dir="$sr"%s --sysroot="$sr" "$@"\n' "$(readlink -f "$HOST_CLANG_EXE")" "$clangres" > $PREFIX/bin/clang
     chmod 755 $PREFIX/bin/clang
     ln -sf clang $PREFIX/bin/clang++