FreeBSD strtoll and strtoull

strtoll() and strtoull() are functions for converting a string to (unsigned) long long integer.

Used in Qt Core.

The sources can be found in qt-everywhere-src-5.11.2/qtbase/src/3rdparty/freebsd.

Copyright (c) 1992, 1993 The Regents of the University of California.
Copyright (c) 2011 The FreeBSD Foundation

BSD 3-clause "New" or "Revised" License.

Copyright (c) 1992, 1993
     The Regents of the University of California.  All rights reserved.

Copyright (c) 2011 The FreeBSD Foundation
All rights reserved.
Portions of this software were developed by David Chisnall
under sponsorship from the FreeBSD Foundation.

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modification, are permitted provided that the following conditions
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   documentation and/or other materials provided with the distribution.
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   may be used to endorse or promote products derived from this software
   without specific prior written permission.

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