Hardcoded check for pkg-config

[Christopher Rodriguez]

Hello,

On line 204 of `configure.ac` there is a check to see if `pkg-config` is
executable on the current system.

However, this check /only/ checks whether (specifically)
`/usr/bin/pkg-config` is executable—meaning that if the user has
`pkg-config` installed in a non-standard location (for instance, if they
are using a system similar to GNU Guix, as I am), it will always fail.

This is a problem because this check on line 204 is a precedent of
configuring against GTK, which is a feature I want to use.

Is there a way this could be fixed upstream, rather than relying on
patches during the packaging process?

Thank You for Your time!

--

Christopher Rodriguez

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