Revert "VS, WINCE: Fix entry point for Unicode builds"

This reverts commit 681cda02bf656c1cc114632d60afc8bd0cac4b09.
The selection of entry point depends on the source code content
and is independent of whether _UNICODE is defined.
Merge topic 'fix-wince-unicode-entry-point' into next

df01a380 Revert "VS, WINCE: Fix entry point for Unicode builds"