msi: Don't fail if the directory already exists in MsiCreateAndVerifyInstallerDirectory.
[wine] / dlls / fwpuclnt /
drwxr-xr-x   ..
-rw-r--r-- 63 Makefile.in
-rw-r--r-- 4942 fwpuclnt.spec
-rw-r--r-- 4445 main.c