install-wrappers: Add config file symlinks for triples with vendor "pc"

install-wrappers.sh

@@ -126,6 +126,8 @@ cp wrappers/*-wrapper.sh "$PREFIX/bin"
 cp wrappers/mingw32-common.cfg $PREFIX/bin
 for arch in $ARCHS; do
     cp wrappers/$arch-w64-windows-gnu.cfg $PREFIX/bin
+    # Also accept `--target=$arch-pc-windows-gnu` style arg
+    ln -sf $arch-w64-windows-gnu.cfg $PREFIX/bin/$arch-pc-windows-gnu.cfg
 done
 if [ -n "$HOST" ] && [ -n "$EXEEXT" ]; then
     # TODO: If building natively on msys, pick up the default HOST value from there.