[Gnash-dev] check_equals() macro for actionscript tests

[strk]

I've added a check_equals(obtained, expected) macro in the
check.as utility lib in an attempt to give more informations
out of existing tests.

If a test fails the report will tell what the obtained
and expected result were. This might be useful to receive
reports about eventually "wrong" expectances, from users 
using other flash players.

Next step would be migrating some tests to use the new
macro and publish the updated tests, for wider consumption.

--strk;