Remove hashmap collision warning

It was only used to check hashmap collision rate in the wild,
but it no longer has a purpose and produces spurious messages

src/link/section.c

@@ -194,11 +194,7 @@ void sect_AddSection(struct Section *section)
 		     section->name, typeNames[section->type]);
 	} else {
 		/* If not, add it */
-		bool collided = hash_AddElement(sections, section->name,
-						section);
-
-		if (beVerbose && collided)
-			warnx("Section hashmap collision occurred!");
+		hash_AddElement(sections, section->name, section);
 	}
 }