Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-02-24 11:52 b2ff9a3d

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chore(data/real/nnreal): drop some lemmas (#18492) These lemmas are now available for any semifield, so we don't need them. All these lemmas are @[deprecated] in the Mathlib 4 port and will be removed in the forward-port of this PR.

Estimated changes

deleted theorem nnreal.add_div'
deleted theorem nnreal.add_halves
deleted theorem nnreal.div_add'
deleted theorem nnreal.div_add_div
deleted theorem nnreal.div_add_div_same
deleted theorem nnreal.div_pos
deleted theorem nnreal.div_self_le
deleted theorem nnreal.half_pos
deleted theorem nnreal.inv_lt_inv_iff
deleted theorem nnreal.inv_lt_one
deleted theorem nnreal.inv_pos
deleted theorem nnreal.two_inv_lt_one