ci/build: drop LTO from fedora build

It's been broken for a few months by now and nobody has been interested
in fixing it, so let's drop LTO so that we get the rest of the benefits
from having that build at all.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34318>

.gitlab-ci/meson/build.sh

@@ -121,7 +121,7 @@ case $CI_PIPELINE_SOURCE in
 	      LTO=false
       # enable one by one for now
       elif [ "$CI_JOB_NAME" == "fedora-release" ]; then
-	      LTO=true
+	      LTO=false
       else
 	      LTO=false
       fi