xbps-src: make sure XBPS_WRAPPERDIR is only created in required cases.

- When building a bootstrap pkg and the chroot is not ready (bootstrap).
- When building a pkg within the chroot.

common/xbps-src/shutils/common.sh

@@ -449,7 +449,7 @@ setup_pkg() {
     export XBPS_STATEDIR="${XBPS_BUILDDIR}/.xbps-${sourcepkg}"
     export XBPS_WRAPPERDIR="${XBPS_STATEDIR}/wrappers"
 
-    if [ -z "$CHROOT_READY" -o -n "$IN_CHROOT" ]; then
+    if [ -n "$bootstrap" -a -z "$CHROOT_READY" -o -n "$IN_CHROOT" ]; then
         mkdir -p $XBPS_WRAPPERDIR
     fi