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Antoine PitrouFrançois Saint-Jacques
b6aa4018505
Antoine Pitrou authored and François Saint-Jacques committed 767c9537453
ARROW-6633: [C++] Vendor double-conversion library

Since this is both a mandatory dependency and a small-ish library, vendor it to make the build chain simplier. Also, make its use private, because of Windows DLL exports. This incurs a small (~8-10%) performance hit on specific workloads.

Closes #5832 from pitrou/ARROW-6633-vendor-double-conversion and squashes the following commits:

b1e12c7bc <Antoine Pitrou> Remove unneeded code
85877648e <Antoine Pitrou> Add license
3b89b191e <Antoine Pitrou> Make use of double-conversion private.
9e1da51d1 <Antoine Pitrou> ARROW-6633:  Vendor double-conversion library

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>