ci: enable rust in the Fedora system build job

We previously added a new job running Fedora with nightly rust
toolchain.

The standard rust toolchain distributed by Fedora is new enough,
however, to let us enable a CI build with that too.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Link: https://lore.kernel.org/r/20241015133925.311587-3-berrange@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
index f0cbdf1..19ba5b9 100644
--- a/.gitlab-ci.d/buildtest.yml
+++ b/.gitlab-ci.d/buildtest.yml
@@ -115,7 +115,7 @@
     job: amd64-fedora-container
   variables:
     IMAGE: fedora
-    CONFIGURE_ARGS: --disable-gcrypt --enable-nettle --enable-docs --enable-crypto-afalg
+    CONFIGURE_ARGS: --disable-gcrypt --enable-nettle --enable-docs --enable-crypto-afalg --enable-rust
     TARGETS: microblaze-softmmu mips-softmmu
       xtensa-softmmu m68k-softmmu riscv32-softmmu ppc-softmmu sparc64-softmmu
     MAKE_CHECK_ARGS: check-build