ARROW-1762: [C++] Add note to readme about need to set LC_ALL on some Linux systems
ARROW-1762: [C++] Add note to readme about need to set LC_ALL on some Linux systems

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1284 from wesm/ARROW-1762 and squashes the following commits:

b71cf40 [Wes McKinney] Add note to readme about need to set LC_ALL on some Linux systems

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