mruby-time: remove test case less than Dec 31 23:59:58 1969

mrbgems/mruby-time/test/time.rb

@@ -233,12 +233,4 @@ end
 
 assert('Time.gm with Dec 31 23:59:59 1969 raise ArgumentError') do
   assert_raise(ArgumentError) {Time.gm(1969, 12, 31, 23, 59, 59)}
-end
-
-assert('Time.new can make less than Dec 31 23:59:58 1969') do
-  Time.new(1969, 12, 31, 23, 59, 58).year == 1969
-end
-
-assert('Time.gm can make less than Dec 31 23:59:58 1969') do
-  Time.gm(1969, 12, 31, 23, 59, 58).year == 1969
 end
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