BIND 10 #2810: Fix parallel build

[BIND 10 Development]

#2810: Fix parallel build
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            Reporter:  idl0r         |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  build system  |                    Milestone:  New
            Keywords:                |  Tasks
           Sensitive:  0             |                   Resolution:
         Sub-Project:  Core          |                 CVSS Scoring:
Estimated Difficulty:  unknown       |              Defect Severity:  N/A
  problem                            |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by vorner):

 Scons is nice and user friendly. It, however, has one serious drawback. It
 is very slow. Not that make calling itself recursively on each directory
 would be blazingly fast, but I heard you can have a project where make
 terminates immediately when there's nothing to recompile, while scons
 takes several seconds to discover that.

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Ticket URL: <https://bind10.isc.org/ticket/2810#comment:4>
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