v.builder: remove default link flags -lm, -ldl, -lpthread (use module specific link flags instead) (#10099)

vlib/v/parser/pratt.v

@@ -519,6 +519,7 @@ fn (mut p Parser) go_expr() ast.GoExpr {
 		}
 	}
 	pos := spos.extend(p.prev_tok.position())
+	p.register_auto_import('sync.threads')
 	return ast.GoExpr{
 		call_expr: call_expr
 		pos: pos