[Fontconfig] Coding style

[Jacko Dirks]

Hello all,

I recently found myself going through some sources, and it seemed like
there are some different coding styles used, even within the same file.
Since I currently have some free time, I thought I could maybe do a bit
of cleanup and make a merge request. But I cannot find the coding
standard/style guide. So is there a coding standard? 

Thank you,

Jacko Dirks