update rubyspec's tags

spec/frozen/tags/macruby/core/kernel/caller_tags.txt

@@ -5,4 +5,5 @@ fails:Kernel#caller in a Proc or eval returns the correct definition line for a
 fails:Kernel#caller in a Proc or eval begins with (eval) for caller(0) in eval
 fails:Kernel#caller in a Proc or eval begins with the eval's sender's sender for caller(4) in eval
 fails:Kernel#caller in a Proc or eval shows the current line in the calling block twice when evaled
-fails:Kernel#caller returns the current call stack
+fails:Kernel#caller returns the current call stack
+fails:Kernel.caller returns one entry per call, even for recursive methods

spec/frozen/tags/macruby/core/kernel/spawn_tags.txt

@@ -1,6 +1,4 @@
-fails:Kernel#spawn does not unset environment variables included in the environment hash
 fails:Kernel#spawn joins a new process group if :pgroup => :true
 fails:Kernel#spawn joins the specified process group if :pgroup => pgid
 fails:Kernel.spawn joins a new process group if :pgroup => :true
 fails:Kernel.spawn joins the specified process group if :pgroup => pgid
-fails:Kernel.spawn does not unset environment variables included in the environment hash

spec/frozen/tags/macruby/core/process/spawn_tags.txt

@@ -1,4 +1,2 @@
-fails:Process.spawn does not unset environment variables included in the environment hash
 fails:Process.spawn joins a new process group if :pgroup => :true
 fails:Process.spawn joins the specified process group if :pgroup => pgid
-fails:Process.spawn does not unset environment variables included in the environment hash

spec/frozen/tags/macruby/language/defined_tags.txt

@@ -44,8 +44,6 @@ fails:The defined? keyword for yield returns 'yield' if a block is passed to a m
 fails:The defined? keyword for yield returns 'yield' if a block is passed to a method taking a block parameter
 fails:The defined? keyword for super returns nil when a superclass undef's the method
 fails:The defined? keyword for super for a method taking no arguments returns 'super' from a #define_method when a superclass method exists
-fails:The defined? keyword for super for a method taking no arguments returns 'super' from a block in a #define_method when a superclass method exists
 fails:The defined? keyword for super for a method taking arguments returns 'super' from a #define_method when a superclass method exists
-fails:The defined? keyword for super for a method taking arguments returns 'super' from a block in a #define_method when a superclass method exists
 fails:The defined? keyword for super for a method taking no arguments returns 'super' from a block when a superclass method exists
 fails:The defined? keyword for super for a method taking arguments returns 'super' from a block when a superclass method exists