NFC: build rfal with only with nfc app

lib/lib.mk

@@ -35,10 +35,12 @@ C_SOURCES		+= $(FATFS_DIR)/ff_gen_drv.c
 C_SOURCES		+= $(FATFS_DIR)/diskio.c
 C_SOURCES		+= $(FATFS_DIR)/option/unicode.c
 
+ifeq ($(APP_NFC), 1)
 ST25RFAL002_DIR	= $(LIB_DIR)/ST25RFAL002
 CFLAGS			+= -I$(ST25RFAL002_DIR)
 CFLAGS			+= -I$(ST25RFAL002_DIR)/include
 CFLAGS			+= -I$(ST25RFAL002_DIR)/source/st25r3916
 C_SOURCES		+= $(wildcard $(ST25RFAL002_DIR)/*.c)
 C_SOURCES		+= $(wildcard $(ST25RFAL002_DIR)/source/*.c)
-C_SOURCES		+= $(wildcard $(ST25RFAL002_DIR)/source/st25r3916/*.c)
+C_SOURCES		+= $(wildcard $(ST25RFAL002_DIR)/source/st25r3916/*.c)
+endif