[*]add ENV related with font dpi to make up for not using xft.dpi anymore that was a fix essentially to buffer engine rendering, allow env var for evas font dpi.
[*]add ENV related with font dpi
to make up for not using xft.dpi anymore that was a fix essentially
to buffer engine rendering, allow env var for evas font dpi.

Change-Id: Icf4ff3f8464303e4312310475e102ac9319c9684

TizenChameleon/evas,TizenChameleon/evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/uifw-evas,TizenChameleon/uifw-evas