[MacPorts] #64602: libusb: Configuration logfiles contain indications of -Wimplicit-function-declaration in "strchr"

[MacPorts]

#64602: libusb: Configuration logfiles contain indications of -Wimplicit-function-
declaration in "strchr"
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  Reporter:  judaew           |      Owner:  michaelld
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.7.1
Resolution:                   |   Keywords:  wimplicit-function-declaration
      Port:  libusb autoconf  |
------------------------------+--------------------------------------------

Comment (by ryandesign):

 `configure.checks.implicit_function_declaration.whitelist-append strchr`
 is indeed what I have been adding to ports in this situation.

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Ticket URL: <https://trac.macports.org/ticket/64602#comment:6>
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