message: Add g++ to Fedora build dependency documentation
  Fixes
diff: @@ -113,7 +113,7 @@ command that should install all of them. If something is still found to be
  missing, please open an issue.
  ```sh
  -dnf install cmake freetype-devel fontconfig-devel libxcb-devel
  +dnf install cmake freetype-devel fontconfig-devel libxcb-devel g++
  ```
  #### CentOS/RHEL 7
  