test_fiber.rb: longer timeout

* test/ruby/test_fiber.rb (test_many_fibers): make timeout longer.
  10sec is not sufficient.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_fiber.rb

@@ -46,7 +46,7 @@ class TestFiber < Test::Unit::TestCase
   end
 
   def test_many_fibers_with_threads
-    assert_normal_exit %q{
+    assert_normal_exit <<-SRC, timeout: 60
       max = 1000
       @cnt = 0
       (1..100).map{|ti|
@@ -60,7 +60,7 @@ class TestFiber < Test::Unit::TestCase
       }.each{|t|
         t.join
       }
-    }
+    SRC
   end
 
   def test_error