gplugin/gplugin

Make the names inside the .pc files match the pc filename

2021-09-24, Gary Kramlich
069c014ed85f
Make the names inside the .pc files match the pc filename

As far as I can tell this is purely cosmetic, but it should probably match nonetheless.

Testing Done:
ran `PKG_CONFIG_PATH=$(pwd)/meson-private pkg-config --modversion` from the build directory with and without the patch and made sure there was no difference.

Reviewed at https://reviews.imfreedom.org/r/935/
# GPlugin
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GPlugin is a GObject based library that implements a reusable plugin system.
It supports loading plugins in multiple other languages via loaders. It relies
heavily on [GObjectIntrospection](https://gi.readthedocs.io/) to expose its API
to the other languages.
It has a simple API which makes it very easy to use in your application.
For more information on using GPlugin in your application, please see the
[embedding](https://docs.pidgin.im/gplugin/latest/chapter-embedding.html) page.
## History
GPlugin has a bit of history, you can read more about it in [HISTORY.md](HISTORY.md)
## Language Support
GPlugin currently supports plugins written in C/C++, Lua, Perl5, Python3, and
Vala.
## API Reference
The in-development API reference for the development branch can be found at
[docs.pidgin.im/gplugin/latest](https://docs.pidgin.im/gplugin/latest/).