shlwapi: Add implementation for StrCatChainW.

[Sebastian Lackner]

Based on a patch by Huw Campbell.
---
 dlls/shlwapi/shlwapi.spec   |   1 +
 dlls/shlwapi/string.c       |  41 +++++++++++++++
 dlls/shlwapi/tests/string.c | 122 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 164 insertions(+)
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