xbps-src: fix clean-repocache

xbps-remove needs the right rootdir to not remove packages still required
by repos. Without it it will just delete everything since it can't be
found in any of the registered repositories.

xbps-src

@@ -866,8 +866,16 @@ case "$XBPS_TARGET" in
         fi
         ;;
     clean-repocache)
-        export XBPS_TARGET_ARCH="${XBPS_CROSS_BUILD:-$XBPS_TARGET_MACHINE}"
-        $XBPS_REMOVE_CMD -C /dev/null -c $XBPS_HOSTDIR/repocache-${XBPS_TARGET_ARCH} -O
+        if [ -n "$CHROOT_READY" -a -z "$IN_CHROOT" ]; then
+            chroot_handler $XBPS_TARGET $XBPS_TARGET_PKG || exit $?
+        else
+            if [ "$XBPS_CROSS_BUILD" ]; then
+                setup_env "$XBPS_CROSS_BUILD"
+                $XBPS_REMOVE_XCMD -c "$XBPS_HOSTDIR/repocache-${XBPS_TARGET_MACHINE}" -O
+            else
+                $XBPS_REMOVE_CMD -c "$XBPS_HOSTDIR/repocache-${XBPS_TARGET_MACHINE}" -O
+            fi
+        fi
         ;;
     consistency-check)
         consistency_check