src: meson: Define system paths

Define libcamera specific system paths for use within the library code
base. These can be used to identify system configuration files and
shared data.

Also, make use of the new system path variables and map the ipa paths
upon the libcamera system path, making use of the new shorter syntax for
join_paths().

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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