gethostbyaddr() fails on the hostname of GitHub CI containers

--- a/tests/LTsock.c
+++ b/tests/LTsock.c
@@ -262,6 +262,3 @@
-    if (gethostname(hnm, sizeof(hnm) - 1)) {
-	cem = "ERROR!!!  can't get this host's name";
-	goto print_errno;
-    }
+    strncpy(hnm, "localhost", sizeof(hnm) - 1);
     hnm[sizeof(hnm) - 1] = '\0';
     if (!(hp = gethostbyname(hnm))) {