Windows : fix the definition of EAPI

Windows : fix the definition of EAPI

Summary:
with autotools, EFL_BUILD was passed to the preprocessor for libraries and binaries, which was wrong. Only libraries must have EFL_BUILD defined. See T7797 for an explanation
This also fix EAPI in Ecore_Getopt.g and Efl_UI.h

Also note that all the wayland and drm Makefile's have not been touched

Test Plan: compilation

Reviewers: raster, zmike, cedric

Subscribers: #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8602