[APPWIZ] Shortcut: Rename if there is a conflict (#6556)
Follow-up to #6550. Avoid same name
overwriting.
JIRA issue: CORE-5866
- Rename the filename if there was duplicate.
- Simplify CreateShortcut function.
- Rename IDC_SHORTCUT_LOCATION as
IDC_LINK_LOCATION to resolve name conflict
with shell32/shresdef.h.
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