msi: Don't fail if the directory already exists in MsiCreateAndVerifyInstallerDirectory.
[wine] / dlls / msgsm32.acm /
drwxr-xr-x   ..
-rw-r--r-- 87 Makefile.in
-rw-r--r-- 71 msgsm32.acm.spec
-rw-r--r-- 19596 msgsm32.c