missing reference for esp_log_timestamp

Author: yuetloo

esp32c3/components/log/Makefile

@@ -1,6 +1,7 @@
 LIB = liblog.a
 LIB_SRCS = $(IDF_PATH)/log/log.c \
-           $(IDF_PATH)/log/log_buffers.c
+           $(IDF_PATH)/log/log_buffers.c \
+           $(IDF_PATH)/log/log_freertos.c
 
 EXTRA_CFLAGS= -I$(IDF_PATH)/log/include \
                 -I$(IDF_PATH)/esp_rom/include \