remove use of GeanyFunctions, fix deprecated warning

[andy5995]

This fixes the compiler warning about the deprecated GeanyFunctions
https://github.com/geany/geany/blob/9c91c287803ae05ce0f2aacd605564301e0ef4aa/src/plugindata.h#L408)

[xuhdev]

Do you have idea whether there needs a replacement?

[andy5995]

Pretty sure it doesn't. Here's what @elextr one of the @geany maintainers said about it...

it can't be removed if something used it

When I remove that line, editorconfig still builds, and is available from the Geany plugins manager. I tested it to make sure.

[xuhdev]

According to geany/geany-plugins#382 , it seems like we also need to bump API version if we are to remove GeanyFunctions, so as to prevent users on older geany from building.

[elextr]

@andy5995 I was actually talking about Geany code in the quote you taketh in vain. :)

But it does indeed also apply correctly to the plugin too, if nothing in the plugin uses that variable, why declare it :)

@xuhdev this is to remove it from the plugin, not from Geany.

[xuhdev]

Thanks all!