s390/atomic_ops: Disable flag outputs constraint for GCC versions below 14.2.0

GCC may die with an ICE if the flag outputs constraint is used in
combination with other inline assemblies. This will be fixed with
GCC 14.2.0.

Therefore disable the use of the constraint for now.

Link: https://gcc.gnu.org/git?p=gcc.git;a=commit;h=cd11413ff7c4353a3e336db415304f788d23a393


Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>