On Fedora 33 GCC defaults to -Wmissing-prototypes and emits warnings about function prototypes missing. If -Werror is specified, this breaks compilation. We also default to -Werror=implicit-function-declaration Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-By: Robbie Harwood <rharwood@redhat.com> Reviewed-By: Rob Crittenden <rcritten@redhat.com>