Revert "fix windows build"

This reverts commit 45504f9ba8de2a4372193910b2cb9405f1ea896a.

The problem that is apparently fixed here is that link.exe is too dumb
to pick the right entry-point if the WinMain definition does not come
from an object file but a .lib; in that case it apparently defaults to
archaic 8-bit WinMain so tell it to use Unicode one with /ENTRY.

Conflicts:

	desktop/Executable_sbase.mk
	desktop/Executable_scalc.mk
	desktop/Executable_sdraw.mk
	desktop/Executable_simpress.mk
	desktop/Executable_smath.mk
	desktop/Executable_sweb.mk
	desktop/Executable_swriter.mk

Change-Id: Ib6239eb0fd3d64fd4a292a0d42d65ef75475c389
(cherry picked from commit 07359c242830bcc934d491870cdf5cb70fc26414)