The configuration option was renamed with kernel 4.19 from
CONFIG_CC_STACKPROTECTOR to CONFIG_STACKPROTECTOR adapt the code to set
both options.
CONFIG_STACKPROTECTOR now sets the regular stack protector and
CONFIG_STACKPROTECTOR_STRONG activates the additional protection of more
functions.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>