buildroot

libgpgme: fix build on MIPS with older kernel headers

MIPS N64 ABI has been missing getdents64 wire up until kernel version
3.10. Disable use of getdents on older kernels.

Fixes:
http://autobuild.buildroot.net/results/961/9619062ce6642ae4121d7debb3b4c632c88723d5/

Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Cc: Philipp Claves <claves@budelmann-elektronik.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>