[Pidgin] #17396: Build failure with python-3.8

[Pidgin]

#17396: Build failure with python-3.8
--------------------+--------------------------
 Reporter:  yarda   |      Owner:  EionRobb
     Type:  defect  |     Status:  new
Milestone:          |  Component:  unclassified
  Version:  2.13.0  |   Keywords:
--------------------+--------------------------
 The pidgin 2.13.0 doesn't seem to be compatible with python-3.8, the build
 fails:
 {{{
 ...
   CCLD     finch
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `Py_Finalize'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `_Py_Dealloc'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PyUnicode_FromString'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `Py_SetProgramName'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PySys_GetObject'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PyRun_SimpleFileExFlags'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PyErr_Occurred'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PyList_Insert'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `Py_Initialize'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `PyErr_Print'
 BUILDSTDERR: /usr/bin/ld: ./libgnt/.libs/libgnt.so: undefined reference to
 `Py_IsInitialized'
 BUILDSTDERR: collect2: error: ld returned 1 exit status
 ...
 }}}

 It's due to following upstream change:
 https://docs.python.org/dev/whatsnew/3.8.html#debug-build-uses-the-same-
 abi-as-release-build

 I.e. the PY_LIB detection code should now use:
 python3-config --libs --embed

 and eventually fallback to:
 python3-config --libs

 Downstream Fedora bugzilla:
 https://bugzilla.redhat.com/show_bug.cgi?id=1716480

--
Ticket URL: <https://developer.pidgin.im/ticket/17396>
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