lcitool: enable Rust for Windows cross targets

The issue that is mentioned in the comment has been fixed.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/docker/dockerfiles/fedora-win64-cross.docker

@@ -120,3 +120,5 @@ ARG USER
 ARG UID
 RUN if [ "${USER}" ]; then \
   id ${USER} 2>/dev/null || useradd -u ${UID} -U ${USER}; fi
+
+ENV ENABLE_RUST 1

tests/lcitool/refresh

@@ -291,10 +291,7 @@ try:
                         project='qemu,qemu-win-installer',
                         cross="mingw64",
                         trailer=cross_build("x86_64-w64-mingw32-",
-                                            "x86_64-softmmu"),
-                        # linking with rust is buggy:
-                        # https://github.com/mesonbuild/meson/pull/14991
-                        enable_rust=False)
+                                            "x86_64-softmmu"))
 
     # We also generate some docker files with minimal dependencies and
     # as many cross-compilers as Debian will package for building TCG