dropbear: rename libtomcrypt symbols to avoid NuttX collisions

Rename base64 and ecc_make_key when CONFIG_CODECS_BASE64/CONFIG_CRYPTO
are enabled alongside Dropbear.

Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>

Author: Abhishekmishra2808

netutils/dropbear/Makefile

@@ -130,6 +130,15 @@ endif
 # Match the ESP-IDF port behavior: LTC_SOURCE is only for libtomcrypt sources.
 $(foreach src,$(TOMCRYPT_SRCS),$(eval $(src)_CFLAGS += ${DEFINE_PREFIX}LTC_SOURCE=1))
 
+# Avoid duplicate symbols when NuttX/apps also provide these APIs.
+ifeq ($(CONFIG_CODECS_BASE64),y)
+$(foreach src,$(TOMCRYPT_SRCS),$(eval $(src)_CFLAGS += ${DEFINE_PREFIX}base64_encode=dropbear_ltc_base64_encode))
+$(foreach src,$(TOMCRYPT_SRCS),$(eval $(src)_CFLAGS += ${DEFINE_PREFIX}base64_decode=dropbear_ltc_base64_decode))
+endif
+ifeq ($(CONFIG_CRYPTO),y)
+$(foreach src,$(TOMCRYPT_SRCS),$(eval $(src)_CFLAGS += ${DEFINE_PREFIX}ecc_make_key=dropbear_ltc_ecc_make_key))
+endif
+
 MAINSRC = dropbear_main.c
 
 ifneq ($(CONFIG_NETUTILS_DROPBEAR_SCP),)