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Fixes #635.

This is/was necessary only on macOS, because you needed root in order
to read the process list. This was never necessary on Linux, and
it also raises security concerns, so now it needs to be enabled
explicitly at build time.

Real fix for issue #438.

Closes #438.

Thank you @Explorer09 for the push!
Closes #417.

Fixes building on case-insensitive filesystems where String.h gets confused with <string.h>.

From d734dacea0a10d0465dad4e95b3421511e7da112 Mon Sep 17 00:00:00 2001
From: David Hunt <dhunt@iolanthe.attlocal.net>
Date: Sat, 11 Jul 2015 20:56:31 -0500
Subject: [PATCH 1/8] Rename String to StringUtils

htop uses scanf functions to parse values from proc filesystem. This
breaks when initializing locale for LC_NUMERIC because of unexpected
commas. So initialize locale for LC_CTYPE only.

This has two effects:

* The locale may have impact on string formatting. So depending on the
  locale we may end up with different decimal point.
* We can use nl_langinfo() for UTF-8 detection.

... and thus make it use a different color than PROCESS_HIGH_PRIORITY.

in ncurses. CPU usage goes down noticeably.
(Also, add missing comma, sorry.)

This is a work-in-progress, code is currently broken.
(Some actions, and notably, the header, are missing.)

Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers.

(thanks to Philipp Hagemeister)