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lmdb-sys: update and patch for heed

Arnaud Ferraris requested to merge a-wai/debcargo-conf:update-lmdb-sys into master

heed is needed as a dependency of Mousai, a GNOME Circle app. However, it relies on lmdb-master-sys, which is essentially a more recent version of lmdb-sys. In order to avoid carrying multiple nearly identical crates (especially bindings to the same underlying C library), this patch adds the following changes to lmdb-sys:

  • add new constant and type declarations
  • make all existing structs implement the Clone and Copy traits
  • don't require function pointers to be *mut; this can be done as no reverse dependency uses the modified functions so far, heed will be the first user of those

Those changes are enough for heed to work fine with this crate instead of lmdb-master-sys.

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