[bug #46832] Heap buffer overflow on long target lines

[Paul D. Smith]

Update of bug #46832 (project make):

              Item Group:                    None => Bug                    
                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
           Fixed Release:                    None => SCM                    
           Triage Status:                    None => Small Effort           

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Follow-up Comment #1:

This is because the longest string allowed in the cache was 65535 (because the
length is stored in an unsigned short).  I seriously doubt that there are real
makefiles out there with strings longer than that, but I added a last-ditch
cache to hold arbitrarily long strings.

Fix pushed to Git.

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