package/libsepol: drop bogus BR2_TOOLCHAIN_HEADERS_AT_LEAST_2_6
The inexistent symbol is reference since this commit from 2020:
'55784bcbfa package/libsepol: set default policy version'
Cc: Clayton Shotwell <clayton.shotwell@collins.com>
Cc: Marcus Folkesson <marcus.folkesson@gmail.com>
Cc: Matt Weber <matthew.weber@collins.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 6c44b8a37957b543568e523546ad571eb157bd90)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Ricardo Martincoski