sxs: Implement a stub CreateAssemblyCache to make Publish or Perish install.

[Kai Blin]

As mentioned by the authors of Publish or Perish in their FAQ
(http://www.harzing.com/pop_faq.htm#Q309), Wine exporting sxs.dll and not
providing a real CreateAssemblyCache function trips up the installer.
This patch allows Publish or Perish to install without issues.

Thanks to Donnie Berkholz for pointing me at this issue.
---
 dlls/sxs/sxs.c    |   10 ++++++++++
 dlls/sxs/sxs.spec |    2 +-
 2 files changed, 11 insertions(+), 1 deletions(-)
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