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During "as-installed" testing, we should search the GIR_DIR for GIR XML, instead of hard-coding that it is `${prefix}/share/gir-1.0`. This is not the case on at least Debian, in order to make it possible to install more than one architecture's flavour of `GLib-2.0.gir`, which contains some architecture-specific `#define`s. Also search GOBJECT_INTROSPECTION_DATADIR/GIR_SUFFIX (in practice something like `/usr/share/gir-1.0` in all cases) to accommodate distributions like Debian that move the architecture-independent majority of GIR XML into /usr/share to avoid duplication, leaving only the architecture-specific minority of files like `GLib-2.0.gir` in the GIR_DIR. Signed-off-by: Simon McVittie <smcv@collabora.com>