c3418b Update to 4.39:

Authored and Committed by Jerry James 5 years ago
    Update to 4.39:
    - Automatic creation of subdirectories of auxdir
    - Add error diagnostics to if_source
    - Allow print_type = 'auto'
    - Fix use of directories with names containing perl glob characters
    - Ensure that subdirectories are created properly
    - In output of dependencies, include pathname of target file(s) in the rule.
    - In -pvc mode, writing of deps file is per make not per overall run.
    
        
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