Fix a #define
Fix a #define

I don't think it was causing any problems, but
    TimeToUS(x+y)
would have evaluated to
    x + (y / 1000)

MERGED from commit 54121fffb5ee069d9b7a5628104ff1114ea87182

On the 7.4 branch, this was causing a wrong conversion in
getDelayTarget.

Signed-off-by: Paolo Capriotti <f38d7462b2a577892992441e880dd1fb9cea5725@gmail.com>

ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix