Provide dlltool via a shell script wrapper that sets the default architecture

wrappers/dlltool-wrapper.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+TARGET="$(basename $0 | sed 's/-[^-]*$//')"
+ARCH=$(echo $TARGET | sed 's/-.*//')
+case $ARCH in
+i686)    M=i386        ;;
+x86_64)  M=i386:x86-64 ;;
+armv7)   M=arm         ;;
+aarch64) M=arm64       ;;
+esac
+llvm-dlltool -m $M "$@"