tools/sim: resolve import error on MacOS running Metadrive (#33244)

fix dynamic lib linking on mac

selfdrive/controls/lib/longitudinal_mpc_lib/SConscript

@@ -73,6 +73,8 @@ lenv["CXXFLAGS"].append("-DACADOS_WITH_QPOASES")
 lenv["CCFLAGS"].append("-Wno-unused")
 if arch != "Darwin":
   lenv["LINKFLAGS"].append("-Wl,--disable-new-dtags")
+else:
+  lenv["LINKFLAGS"].append("-Wl,-install_name,@loader_path/libacados_ocp_solver_long.dylib")
 lib_solver = lenv.SharedLibrary(f"{gen}/acados_ocp_solver_long",
                                 build_files,
                                 LIBS=['m', 'acados', 'hpipm', 'blasfeo', 'qpOASES_e'])