FIX gh-1331 - Check hthor mem limit setting on 32bit
FIX gh-1331 - Check hthor mem limit setting on 32bit

HThor incorrectly computes environment 'defaultMemoryLimitMB' and WU
specified 'hthorMemoryLimit' settings in 32 bit build. Specifying, for
instance, 5000MB overflows and causes incorrect byte count to be computed.
Fix problem with conditionally compiled check to ensure specified value
is <= 4096MB in 32 bit build

Signed-off-by: William Whitehead <9d69611803ea426c9da0f43b4e04fcc22652476d@lexisnexis.com>

afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform