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meson: Fix race condition in GIR generation of internal components

amyspark requested to merge amyspark/gstreamer:fix-race-condition-in-generate_gir into main

Using the component name implies that the GIR is already available in the system. Instead, by using the GirTarget that Meson provides, Meson can let g-ir-scanner know that the module and its associated pkg-config files have not yet been installed to the system.

This fixes a race condition on Ninja 1.11+ where it would be possible to, given enough cores, run the GIR generation simultaneously on a module and its dependents.

See also !804 (comment 1545208)

See https://github.com/mesonbuild/meson/blob/master/mesonbuild/modules/gnome.py#L810, https://gitlab.freedesktop.org/gstreamer/cerbero/-/pipelines/1277369

cc @tpm

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