package/meson: use wrappers for g-ir-scanner and g-ir-compiler

We need to backport a commit to allow us to override the g-ir-scanner
and g-ir-compiler binaries in the gnome module.

By default since meson looks for these binaries as native: true
dependencies it would use the host versions instead of the wrappers
which are not useable for target package builds. Override this behavior
by specifying the correct wrapper binaries in cross-compilation.conf.

Fixes:
http://autobuild.buildroot.net/results/f49/f49bb57a6ec2890f489fbd55ced9c9249d066334/build-end.log



Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
[yann.morin.1998@free.fr:
  - expand on why the backported patch does not closely match upstream
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>