Make AddSpecialCars compatible with VehFuncs

[JuniorDjjr]

Instead of completely replacing the function, keep the original, if your custom condition is false, return at 0x6D2379 to read the original condition with mine too.

Don't test the current VehFuncs version, I soon will release an update where my patch will be at 0x6D2379.

GTA-Projects/SA_AddSpecialCars/SA_AddSpecialCars.cpp

Line 955 in c9f186b

patch::RedirectJump(0x6D2370, IsLawEnforcementVehicle);