Remove the gn target //build/linux:fontconfig in favor of //third_party/fontconfig
Remove the gn target //build/linux:fontconfig in favor of //third_party/fontconfig

Chromium commit fd3053f2b5130ecb6c2d7a61f2a146e777c6273a

brave/electron,brave/electron,brave/muon,brave/electron,brave/muon,brave/electron,brave/muon,brave/muon,brave/muon,brave/electron,brave/muon,brave/electron