[rfc][icedtea-web] Remove legacy xulrunner check

[Adam Domurad]

Hi all. Now that the legacy NPAPI support has been dropped, this check 
should be dropped too.
Worse yet, this #ifdef incorrectly was activated when helping someone 
build on a clean F18. Investigating the issue is possible -- but 
dropping it is easier and makes sense.

Note, this is the only occurrence of 'LEGACY_XULRUNNERAPI'.

Happy hacking,
-Adam
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