SystemInformation: make QueryMemory() return bool
SystemInformation: make QueryMemory() return bool

The other query functions return bool and the only values ever returned
here were 0 and 1 anyway.

Change-Id: Ibd6b562afda95cd05a87f1fe4959ff9ee7a11885

chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys