duplicate symbol patterns in version information

[Jan Beulich]

Hello,

while there is a check in lang_register_vers_node to make sure that the
new tree's patterns do not collide with other trees' patterns of the
opposite type, no check is made to ensure the same for the tree being
installed.

Thank you for your attention,

i.A. Jan Beulich
Software Engineer Senior
Novell Linux Platform Engineering

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