build: Use global RPATH value
build: Use global RPATH value

Also introduce ORIGIN for crosscompiler.

RPATH can be convenient to avoid developer to deal with environment variables
(LD_LIBRARY_PATH or PATH on windows), as we're using them for now.

In longer term, this can be replaced by relative pathes,
once the installation process is fixed
(at least on systems supporting ORIGIN).

It was tested on yocto poky master.

Bug: https://jira.iotivity.org/browse/IOT-1745
Change-Id: Ibaabc31b8dc744267e4c6c1c682d2090da9ada96
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>
Origin: https://gerrit.iotivity.org/gerrit/#/c/21589/

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