Add separate interface library KDev::IExecute for execute/iexecuteplugin.h

Authored by kossebau on Aug 9 2017, 4:31 PM.

Description

Add separate interface library KDev::IExecute for execute/iexecuteplugin.h

Summary:
Avoids adding the ${KDevPlatform_SOURCE_DIR}/plugins dir to the
include dirs of everything linking the "normal" libs

Reviewers: KDevelop, kfunk

Reviewed By: KDevelop, kfunk

Subscribers: kfunk, kdevelop-devel

Differential Revision: https://phabricator.kde.org/D7219