ci-linux.yml: Add libfontconfig-dev in preparation for ubuntu 24.04

Author: startaq

.github/workflows/ci-linux.yml

@@ -48,7 +48,7 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install -y libsdl2-dev libsdl2-ttf-dev libasound2-dev libxinerama-dev libxi-dev qtbase5-dev qtbase5-dev-tools
+        sudo apt-get install -y libsdl2-dev libsdl2-ttf-dev libfontconfig-dev libasound2-dev libxinerama-dev libxi-dev qtbase5-dev qtbase5-dev-tools
     - name: Install clang
       if: matrix.compiler == 'clang'
       run: sudo apt-get install -y clang