Add define for missing EAI_ADDRFAMILY in BSD/OS 4.3.

src/include/port/bsdi.h

@@ -8,3 +8,8 @@
 #define HAS_TEST_AND_SET
 
 typedef unsigned char slock_t;
+
+/* This is marked as obsoleted in BSD/OS 4.3. */
+#ifndef EAI_ADDRFAMILY
+#define  EAI_ADDRFAMILY		1
+#endif