Change: disable precompiled headers on Linux (GCC - Dedicated) target to ensure those still build

.github/workflows/ci-build.yml

@@ -88,7 +88,7 @@ jobs:
         - name: GCC - Dedicated
           compiler: gcc
           cxxcompiler: g++
-          extra-cmake-parameters: -DOPTION_DEDICATED=ON -DCMAKE_CXX_FLAGS_INIT="-DRANDOM_DEBUG"
+          extra-cmake-parameters: -DOPTION_DEDICATED=ON -DCMAKE_CXX_FLAGS_INIT="-DRANDOM_DEBUG" -DCMAKE_DISABLE_PRECOMPILE_HEADERS=ON
           # Compile without SDL / SDL2, as that should compile fine too.
 
     name: Linux (${{ matrix.name }})