[Server] Fix GCC build

apps/openmw-mp/Script/LangLua/LangLua.cpp

@@ -110,10 +110,10 @@ template<> struct F_<3> { static constexpr LuaFuctionData F{"CallPublic", LangLu
 template<unsigned int I>
 struct C
 {
-    constexpr C(LuaFuctionData *functions_)
+    constexpr static void Fn(LuaFuctionData *functions_)
     {
         functions_[I] = F_<I>::F;
-        C<I - 1>::C(functions_);
+        C<I - 1>::Fn(functions_);
     }
 };
 
@@ -121,7 +121,7 @@ struct C
 template<>
 struct C<0>
 {
-    constexpr C(LuaFuctionData *functions_)
+    constexpr static void Fn(LuaFuctionData *functions_)
     {
         functions_[0] = F_<0>::F;
     }
@@ -132,7 +132,7 @@ LuaFuctionData *functions()
 {
 
     static LuaFuctionData functions_[LastI];
-    C<LastI - 1>::C(functions_);
+    C<LastI - 1>::Fn(functions_);
 
     static_assert(
         sizeof(functions_) / sizeof(functions_[0]) ==

apps/openmw-mp/Script/Types.hpp

@@ -103,9 +103,13 @@ struct CallbackIdentity
 struct ScriptFunctionPointer : public ScriptIdentity
 {
     void *addr;
-
+#if (!defined(__clang__) && defined(__GNUC__))
+    template<typename R, typename... Types>
+    constexpr ScriptFunctionPointer(Function<R, Types...> addr) : ScriptIdentity(addr), addr(reinterpret_cast<void*>(addr)) {}
+#else
     template<typename R, typename... Types>
     constexpr ScriptFunctionPointer(Function<R, Types...> addr) : ScriptIdentity(addr), addr(addr) {}
+#endif
 };
 
 struct ScriptFunctionData