Fix linkage errors

include/verilated.mk.in

@@ -208,7 +208,7 @@ VK_USER_OBJS = $(addsuffix .o, $(VM_USER_CLASSES))
 
 ifneq ($(VM_TRACE_FST),0)
 ifneq ($(VM_TRACE_FST),)
-    LDLIBS = -llz4 -lz
+    LDLIBS += -llz4 -lz
 endif
 endif
 

verilator-config.cmake.in

@@ -743,6 +743,10 @@ function(verilate TARGET)
 
     target_link_libraries(${TARGET} PUBLIC ${VERILATOR_MT_CFLAGS})
 
+    if(${VERILATE_PREFIX}_TRACE_FST)
+        target_link_libraries(${TARGET} PUBLIC -llz4 -lz)
+    endif()
+
     target_compile_features(${TARGET} PRIVATE cxx_std_11)
 
     if(${VERILATE_PREFIX}_TIMING)