ASACORE-1250: Always include AboutClient and AboutService in alljoyn-samples

AboutClient and AboutService use the About functionality that is built
into liballjoyn.so rather than liballjoyn-about.so so they are now
included in the alljoyn-samples package regardless of whether
alljoyn-about is built or not.

Change-Id: I69070975b097e3073aa9324a90e2c8ba52b4a3c5
Signed-off-by: Steve Kinneberg <stevek@qce.qualcomm.com>