Fix for JIRA issue IOT-599.

Fix for JIRA issue IOT-599.

- This patch include changes to install the public libraries in ${libdir} and all
public headers in ${includedir}.
- As of now, the iotivitiy.pc.in file refers to resource C and C++ SDK related libraries only.
- If required, the services related public libraries need to segregated into a different .pc.in
file.

Change-Id: Ie110db76900c29534f6bc36dc9e2424f71e9f71f
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3261
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>