PR #3352 removed the luasrcdiet subpackage definition from luci-base Makefile, and it also removed the HOST_BUILD_DIR definition, which looked like it was related to only luasrcdiet, but apparently that HOST_BUILD_DIR is needed also for the main luci-base package. Fixes #3433 Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>