[icedtea] Drop remaining bits of plugin checks

[Damien Raude-Morvan]

Hi,

Here is a smaller patch to remove remaining check related to plugin code.

2011-01-26  Damien Raude-Morvan <drazzib at drazzib.com>

  Remove NetX and the IcedTea plugin (drop remaining bits from acinclude.m4
  and configure.ac)
  * acinclude.m4:
  (IT_CHECK_PLUGIN): Removed.
  (IT_CHECK_PLUGIN_DEPENDENCIES): Likewise.
  (IT_CHECK_XULRUNNER_VERSION): Likewise.
  * configure.ac: Don't call IT_CHECK_XULRUNNER_VERSION.

If this is okay for you, feel free to commit.

Cheers
-- 
Damien
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