Windows specific fallout of 8b5a984d,
similar to 23605574; can be observed by
building with "make check" from scratch, on the "subsequentcheck" target
one res file depends on some lngconvex executable by way of a custom
target in shell, which causes udkapi to rebuild itself before the make
restart.

Change-Id: I14f370a66f4ac5088da4af7eceede09f5a6bae84