Remove ini_hex, ini_HEX

[GregPlowman]

When precompiling DoubleFloats, I'm getting this warning:

Julia-1.6.1> using DoubleFloats
[ Info: Precompiling DoubleFloats [497a8b3b-efae-58df-a0af-a86822472b78]
WARNING: could not import Printf.ini_hex into DoubleFloats
WARNING: could not import Printf.ini_HEX into DoubleFloats

Firstly, I don't really understand this code.

But it seems ini_hex and ini_HEX are not used in this file (src/type/show.jl).

Also it seems Printf no longer uses ini_hex and ini_HEX.
I think they were removed in "Rewrite printf functionality" #32859

[codecov]

Codecov Report

Merging #125 (4832ff5) into master (7814faf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #125   +/-   ##
=======================================
  Coverage   45.86%   45.86%           
=======================================
  Files          63       63           
  Lines        3203     3203           
=======================================
  Hits         1469     1469           
  Misses       1734     1734           

Impacted Files	Coverage Δ
src/type/show.jl	7.50% <ø> (ø)

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[JeffreySarnoff]

yes -- thank you Greg.