advpack: Don't fail if the dll to register doesn't exist.
[wine] / dlls / advpack /
drwxr-xr-x   ..
-rw-r--r-- 24 .gitignore
-rw-r--r-- 341 Makefile.in
-rw-r--r-- 30533 advpack.c
-rw-r--r-- 4420 advpack.spec
-rw-r--r-- 1187 advpack_private.h
-rw-r--r-- 32325 files.c
-rw-r--r-- 25916 install.c
-rw-r--r-- 13368 reg.c
drwxr-xr-x - tests