[MacPorts] #62794: py-grpcio: error: use of undeclared identifier 'strnlen'

[MacPorts]

#62794: py-grpcio: error: use of undeclared identifier 'strnlen'
------------------------+-----------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:              |       Port:  py-grpcio
------------------------+-----------------------
 Despite including the legacysupport portgroup,
 [https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/54838/steps
 /install-port/logs/stdio py-grpcio fails to build on 10.6] with:
 {{{
 src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc:568:36:
 error: use of undeclared identifier 'strnlen'
     const size_t lb_token_length = strnlen(
                                    ^
 1 error generated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62794>
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