BIND 10 #1254: define LIBRARY_PATH_PLACEHOLDER more centrally

[BIND 10 Development]

#1254: define LIBRARY_PATH_PLACEHOLDER more centrally
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            Reporter:  jelte         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 I just had to update nearly every test makefile because the placeholder
 for the library paths needed another value. Since these are nearly the
 same almost everywhere, I think we could better define it in configure.ac
 or somewhere up there (similar to COMMON_PYTHON_PATH)

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Ticket URL: <http://bind10.isc.org/ticket/1254>
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