message: Add `fontconfig-devel` dependency for building on Void Linux
diff: @@ -164,7 +164,7 @@ On [Void Linux](https://voidlinux.eu), install following packages before
  compiling Alacritty:
  ```sh
  -xbps-install cmake freetype-devel freetype expat-devel fontconfig xclip
  +xbps-install cmake freetype-devel freetype expat-devel fontconfig-devel fontconfig xclip
  ```
  #### FreeBSD
  