mbedtls: configs: inet_pton fallback

`x509_crt.c` relies on an implementation of `inet_pton`, unless
`MBEDTLS_TEST_SW_INET_PTON` is defined. Since `inet_pton` is only
defined when `POSIX_NETWORKING` is, define the software fallback
if it is not.

Signed-off-by: Jordan Yates <[email protected]>

Author: JordanYates

modules/mbedtls/configs/config-mbedtls.h

@@ -404,6 +404,9 @@
 	defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
 	defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED)
 #define MBEDTLS_X509_CRT_PARSE_C
+#ifndef CONFIG_POSIX_NETWORKING
+#define MBEDTLS_TEST_SW_INET_PTON
+#endif
 #endif
 
 #if defined(CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT) && \