package/gobject-introspection/Config.in: Allow RISCV_32 builds

package/gobject-introspection/Config.in: Allow RISCV_32 builds

Qemu 6.0.0 no longer segfaults when running qemu-riscv32. As such, it's now
possible to allow riscv32 to compile gobject-introspection.

This partially reverts commit c94a212390e33c122cf9db4c772caf8bf3804565.
The symbol BR2_PACKAGE_GOBJECT_INTROSPECTION_ARCH_SUPPORTS is kept, even
though it is now equivalent to BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS,
because it's likely that architecture dependencies will pop up again in
the future.

The configuration of a previously failing autobuilder [1] now passes.

[1] http://autobuild.buildroot.org/results/668397b1df42297505e6fc8353c4752290a5628d

Signed-off-by: Adam Duskett <aduskett@rivian.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>