configure: bump fontconfig requirement for all platforms.
In a previous commit, I bumped it for Windows only, where major bugs had been fixed in recent fontconfig. Yet as Mitch notes, Debian testing has Fontconfig 2.12.6, so we can simply use the same requirement on all platforms. No need to make our configuration script over-complicated with per-platform requirements here.
Showing with 3 additions and 13 deletions