[webkit-gtk] Too many build warnings

[Brendan Long]

Any chance we could disable -Wdeprecated-declarations and 
-Wunused-parameter? I get an completely useless wall of warnings every 
time I build. By having so many warnings, it's impossible to see if any 
of them are actually important.

On a related note, there's also a bunch of undeclared symbol warnings. 
How do we fix that? I tried looking for webkitdomgtk-sections.txt, but 
the only results are in the WebKitBuild folder..