winex11.drv: Hack to delete already-created destination context in wglShareLists() (try 2)

[Jim Cameron]

Homeworld 2 calls wglShareLists() to share two
contexts having already called wglMakeCurrent() on
both, thus forcing Wine to create both contexts. This
causes wglShareLists() to bomb with a "already
created" error. This patch instead deletes the
destination context, if it exists, before sharing.

(try 2) Fixed formatting in patch to replace tabs with
spaces.
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