Make 'TDEConfigINIBackEnd::parseSingleConfigFile' reentrant.r14.1.x

If a second call to 'TDEConfigINIBackEnd::parseSingleConfigFile' was called from
another thread while the first wasn't finished, it would have resulted
in a SEGV fault. Config files are usually small and mmap-ing files
does not provide meaningful benefits while instead introducing the
possibility of a SIGBUS fault, although extremely unlukely in real
life.

This resolves issue #379.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 884aff988556c5271eb829768b17d27052a08763)

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