1602 - Concurrency Group '%s' has no limits defined.
Description
    
Concurrency Groups defined in Settings() must specify at least
one limit in order to be effective.
    
Example
    
Config:
    Settings
{
    .Group1 =
    [
        .ConcurrencyGroupName = 'link'
    ]
    .ConcurrencyGroups = { .Group1 }
}
Output:
C:\Test\fbuild.bff(1,1): FASTBuild Error #1602 - Settings() - Concurrency Group 'link' has no limits defined.
Settings
^
\--here
Fix:
Settings
{
    .Group1 = 
    [
        .ConcurrencyGroupName   = 'link'
        .ConcurrencyLimit       = 4
    ]
    .ConcurrencyGroups = { .Group1 }
}
    