libcamera: yaml_parser: Use C locale

When parsing configuration files on systems with differing locales, the
use of strtod can produce different results, or in the worst case - fail
to parse expected values.

Fix this by using strtod_l() instead. To avoid constructing and
destructing a locale_t instance for every use of strtod_l(), create an
RAII class that wraps the locale_t and use it to provide a global "C"
locale.

Bug: https://bugs.libcamera.org/show_bug.cgi?id=174
Bug: https://github.com/raspberrypi/libcamera/issues/29
Reported-by: https://github.com/kralo
Reported-by: Hannes Winkler <hanneswinkler2000@web.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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