xbps-src: create XBPS_WRAPPERDIR in the upperdir with overlayfs.

common/xbps-src/shutils/common.sh

@@ -447,7 +447,10 @@ setup_pkg() {
 
     export XBPS_STATEDIR="${XBPS_BUILDDIR}/.xbps-${sourcepkg}"
     export XBPS_WRAPPERDIR="${XBPS_STATEDIR}/wrappers"
-    mkdir -p $XBPS_WRAPPERDIR
+
+    if [ -z "$CHROOT_READY" -o -n "$IN_CHROOT" ]; then
+        mkdir -p $XBPS_WRAPPERDIR
+    fi
 
     source_file $XBPS_COMMONDIR/environment/build-style/${build_style}.sh
 }