Revert "Enable LTO"

This reverts commit f30b507b28.

Disabling LTO again as it is causing issues:

 - https://bugzilla.redhat.com/show_bug.cgi?id=2261845
 - https://bugzilla.redhat.com/show_bug.cgi?id=2262065

mesa.spec

@@ -388,6 +388,11 @@ export MESON_PACKAGE_CACHE_DIR="%{cargo_registry}/"
 %rewrite_wrap_file unicode-ident
 %endif
 
+# We've gotten a report that enabling LTO for mesa breaks some games. See
+# https://bugzilla.redhat.com/show_bug.cgi?id=1862771 for details.
+# Disable LTO for now
+%define _lto_cflags %{nil}
+
 %meson \
   -Dplatforms=x11,wayland \
   -Ddri3=enabled \