RFC: xulrunner compilation check not optional

[Robert Schuster]

Hi,
current tip does not build if you disable plugin and npplugin since a
check for the mozilla headers is compiled anyways. The attached patch
(preliminary, needs better formatting) makes the check dependend on
whether any of the plugins is enabled.

I am also not 100% sure if it is right. Maybe xulrunner is also needed
for other stuff.

I talked to Mark on IRC about this and was asked to post the patch here.

Regards
Robert
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