cmake: Fix a typo in the options
cmake: Fix a typo in the options

Signed-off-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>

wingyplus/cmocka,clibs/cmocka,VladimirTyrin/cmocka,wingyplus/cmocka,VladimirTyrin/cmocka,tyc/cmocka,clibs/cmocka,tyc/cmocka,dsch/cmocka,JonathonReinhart/cmocka,tyc/cmocka,JonathonReinhart/cmocka,jamesmunns/CMocka,jamesmunns/CMocka,dsch/cmocka