[FAB-12236] only use race detector on x86_64
[FAB-12236] only use race detector on x86_64

Change-Id: I47d593abf4016f1b3695862df2c90a8ee837b51c
Signed-off-by: Matthew Sykes <89c6e4c9c1046731a9c37abefc223a83de36a5d9@us.ibm.com>

jimthematrix/fabric,xixuejia/fabric,binhn/fabric,stemlending/fabric,binhn/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,muralisrini/fabric,xixuejia/fabric,stemlending/fabric,manish-sethi/fabric,muralisrini/fabric,hyperledger/fabric,jimthematrix/fabric,stemlending/fabric,binhn/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric