dbghelp: Add stubs for SymSetHomeDirectory.

[Andrew Cook]

procmon calls SymSetHomeDirectoryW when attempting to view more
information about an event.

---
 dlls/dbghelp/dbghelp.spec |  4 ++--
 dlls/dbghelp/symbol.c     | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)


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