Fix build of git version >= 2.29.0 without threads Fixes: - http://autobuild.buildroot.org/results/d41638d1ad8e78dd6f654367c905996b838ee649 Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>