libkcapi: depends on BR2_TOOLCHAIN_HAS_SYNC_4
Since commit
https://github.com/smuellerDD/libkcapi/commit/4d0a5c235536b5f679e6a9b0c847f56c9cfc3835,
libkcapi uses __sync_add_and_fetch_4 and __sync_sub_and_fetch_4
Fixes:
- http://autobuild.buildroot.net/results/de5e136ea433633d836bff1d2ac1d3b461391b83
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Fabrice Fontaine