header: Add cmocka_private header with useful macros.
header: Add cmocka_private header with useful macros.

wingyplus/cmocka,tyc/cmocka,jamesmunns/CMocka,tyc/cmocka,linuxmaniac/cmocka,jhrozek/cmocka,JonathonReinhart/cmocka,aleksandr-vin/cmock,clibs/cmocka,VladimirTyrin/cmocka,JonathonReinhart/cmocka,jamesmunns/CMocka,jschmidlapp/cmocka,jschmidlapp/cmocka,Odie/cmocka,lsjostro/cmocka,dsch/cmocka,linuxmaniac/cmocka,aleksandr-vin/cmock,tyc/cmocka,chadversary/cmocka,dsch/cmocka,Odie/cmocka,chadversary/cmocka,akikoskinen/cmocka,lsjostro/cmocka,clibs/cmocka,jhrozek/cmocka,VladimirTyrin/cmocka,Odie/cmocka,nuumio/cmocka,nuumio/cmocka,nuumio/cmocka,jschmidlapp/cmocka,wingyplus/cmocka,jhrozek/cmocka