wpa_supplicant: Use PF_LOCAL instead of PF_INET*

Using a local socket circumvents the issue of needing any Internet
protocol (PF_INET or PF_INET6) support.
We only use interface ("i" group) ioctls on this socket so we can get
away with using PF_LOCAL instead of requring any Internet protocol
(PF_INET or PF_INET6) support on the system. This simplifies the
patch from 8c7149c.

PR:				286259
Noted by:			kevans
Fixes:				8c7149c
Reviewed by:			kevans, philip,
				zarychtam_plan-b.pwste.edu.pl (mzar)
Differential revision:		https://reviews.freebsd.org/D50050

(cherry picked from commit 6aeec6a)

Author: cschuber

contrib/wpa/src/drivers/driver_bsd.c

@@ -1767,21 +1767,11 @@ bsd_global_init(void *ctx)
 	global->ctx = ctx;
 	dl_list_init(&global->ifaces);
 
-	global->sock = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+	global->sock = socket(PF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 	if (global->sock < 0) {
-	    if (errno == EAFNOSUPPORT) {
-		wpa_printf(MSG_INFO, "INET not supported, trying INET6...");
-		global->sock = socket(PF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0);
-		if (global->sock < 0) {
-		    wpa_printf(MSG_ERROR, "socket[PF_INET6,SOCK_DGRAM]: %s",
-			       strerror(errno));
-		    goto fail1;
-		}
-	    } else {
-		wpa_printf(MSG_ERROR, "socket[PF_INET,SOCK_DGRAM]: %s",
+		wpa_printf(MSG_ERROR, "socket[PF_LOCAL,SOCK_DGRAM]: %s",
 			   strerror(errno));
 		goto fail1;
-	    }
 	}
 
 	global->route = socket(PF_ROUTE,