xbps-src: force reconfiguration of base-directories in sysroot.

... otherwise some required symlinks in sysroot aren't created, and this
seems to be required when cross compiling for i686.

common/xbps-src/shutils/cross.sh

@@ -47,6 +47,8 @@ prepare_cross_sysroot() {
         msg_error "cannot continue due to errors above\n"
     fi
     rm -f $errlog
+    # Create top level symlinks in sysroot.
+    XBPS_ARCH=$XBPS_TARGET_ARCH xbps-reconfigure -r $XBPS_CROSS_BASE -f base-directories
 
     return 0
 }