libc: convert ai_errlist array to designated initializers syntax

Reviewed by:	emaste, glebius
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D52010

lib/libc/net/gai_strerror.c

@@ -46,21 +46,21 @@
  * but are or may be used as extensions or in old code.
  */
 static const char *ai_errlist[] = {
-	"Success",					/* 0 */
-	"Address family for hostname not supported",	/* EAI_ADDRFAMILY */
-	"Name could not be resolved at this time",	/* EAI_AGAIN */
-	"Flags parameter had an invalid value",		/* EAI_BADFLAGS */
-	"Non-recoverable failure in name resolution",	/* EAI_FAIL */
-	"Address family not recognized",		/* EAI_FAMILY */
-	"Memory allocation failure", 			/* EAI_MEMORY */
-	"No address associated with hostname",		/* EAI_NODATA*/
-	"Name does not resolve",			/* EAI_NONAME */
-	"Service was not recognized for socket type",	/* EAI_SERVICE */
-	"Intended socket type was not recognized",	/* EAI_SOCKTYPE */
-	"System error returned in errno", 		/* EAI_SYSTEM */
-	"Invalid value for hints",			/* EAI_BADHINTS */
-	"Resolved protocol is unknown",			/* EAI_PROTOCOL */
-	"Argument buffer overflow"			/* EAI_OVERFLOW */
+	[0] =			"Success",
+	[EAI_ADDRFAMILY] =	"Address family for hostname not supported",
+	[EAI_AGAIN] =		"Name could not be resolved at this time",
+	[EAI_BADFLAGS] =	"Flags parameter had an invalid value",
+	[EAI_FAIL] =		"Non-recoverable failure in name resolution",
+	[EAI_FAMILY] =		"Address family not recognized",
+	[EAI_MEMORY] =		"Memory allocation failure",
+	[EAI_NODATA] =		"No address associated with hostname",
+	[EAI_NONAME] =		"Name does not resolve",
+	[EAI_SERVICE] =		"Service was not recognized for socket type",
+	[EAI_SOCKTYPE] =	"Intended socket type was not recognized",
+	[EAI_SYSTEM] =		"System error returned in errno",
+	[EAI_BADHINTS] =	"Invalid value for hints",
+	[EAI_PROTOCOL] =	"Resolved protocol is unknown",
+	[EAI_OVERFLOW] =	"Argument buffer overflow",
 };
 
 #if defined(NLS)