BIND 10 #1525: configure should fail immediately if no pkg-config?

[BIND 10 Development]

#1525: configure should fail immediately if no pkg-config?
-------------------------------------+-------------------------------------
            Reporter:  jreed         |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  minor         |                       Status:  new
           Component:  build system  |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  Core          |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  Low
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 {{{

 checking for pkg-config... no
 checking for botan-config... no
 ./configure: line 16580: --libs: command not found
 ./configure: line 16581: --cflags: command not found
 ...
 [failure later]

 }}}

 botan-config-1.10 is my executable name.

 Note that later configure.ac does have check and failure for pkg-config
 (used to for sqlite3), so just move this earlier.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1525>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development