hippomocks: Update to latest release (v5.0)

hippomocks: Update to latest release (v5.0)

Refactor build scripts too

Previously we used revision:
8e210c5808d490b26fff69151c801fa28d291fcb

Since upstream tagged a version, so it's safer to align to it.

Bug: https://jira.iotivity.org/browse/IOT-1745
Change-Id: Ib6674b60f70dbae163feea447273324bf7827d6d
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18365
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: C.J. Collier <cjcollier@linuxfoundation.org>
Reviewed-by: JungYong KIM <jyong2.kim@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>