Fix for liboqs on zephyr

When using WolfSSL on zephyr, we need POSIX names for networking systems
calls. This can either be enabled with CONFIG_NET_SOCKETS_POSIX_NAMES or
with CONFIG_POSIX_API. This commit enables support for the latter.

Signed-off-by: Tobias Frauenschläger <t.frauenschlaeger@me.com>

Author: Frauschi

wolfssl/wolfcrypt/settings.h

@@ -1908,7 +1908,7 @@ extern void uITRON4_free(void *p) ;
     void *z_realloc(void *ptr, size_t size);
     #define realloc   z_realloc
 
-    #ifndef CONFIG_NET_SOCKETS_POSIX_NAMES
+    #if !defined(CONFIG_NET_SOCKETS_POSIX_NAMES) && !defined(CONFIG_POSIX_API)
     #define CONFIG_NET_SOCKETS_POSIX_NAMES
     #endif
 #endif