Bug#953348: libpeas: FTBFS with Python 3.8

[Simon McVittie]

Control: tags -1 + patch fixed-upstream

On Sun, 08 Mar 2020 at 11:44:33 +0200, Graham Inggs wrote:
> /usr/bin/ld: .libs/peas-plugin-loader-python.o: in function
> `peas_plugin_loader_python_garbage_collect':
> ./loaders/python3/../../loaders/python/peas-plugin-loader-python.c:204:
> undefined reference to `PyGILState_Ensure'

I suspect it needs to use python3-embed.pc instead of python3.pc, similar
to #952416.

https://gitlab.gnome.org/GNOME/libpeas/-/commit/454e72cd37ae562bd33cb6d1a7ddc93797cedd28

    smcv