VS, WINCE: Fix entry point for Unicode builds

When _UNICODE is defined VS uses wmain instead of main as the entry function.
To make this correctly work on WindowsCE EntryPointSymbol needs to be set to
mainWCRTStartup instead of mainWCRTStartup for console applications and to
wWinMainCRTStartup instead of WinMainCRTStartup for GUI applications.

Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Merge topic 'fix-wince-unicode-entry-point' into next

a4962595 VS, WINCE: Fix entry point for Unicode builds