BUILD: fix that building multi-package project takes time even without changes

BUILD: fix that building multi-package project takes time even without changes

JIRA: SDKRM-955

When using the external builder to rebuild a top level project with a minor change,
the CDT re-builds everything in the dependency chain by invoking make on all
dependent projects.

This is meaningless time consuming because often the make -all does nothing.
This patch updates the preference option to the more efficient build behaviour:
building a project configuration only when it contains changes within Eclipse or
if any of its references have changes within Eclipse.

Change-Id: Ie2d0d09c60c711a0a5369e271a7f1844cb7c9541
Signed-off-by: ChangHyun Lee <leechwin.lee@samsung.com>