configure: Don't use AG_GST_CHECK_FEATURE for checking for gio-unix-2.0
It's meant to be used for external plugins that can then all be disabled via --disable-external. gio-unix-2.0 however is just an optional dependency for the TCP unit test. Also when using AG_GST_CHECK_FEATURE like this, in the --disable-external part there needs to be an AM_CONDITIONAL for the feature with FALSE.
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