Only run fxcop target if fxcop is installed
Only run fxcop target if fxcop is installed

mwilliamson-firefly/aws-sdk-net,mwilliamson-firefly/aws-sdk-net,rafd123/aws-sdk-net,rafd123/aws-sdk-net,mwilliamson-firefly/aws-sdk-net,rafd123/aws-sdk-net