Recently a new dependency on libgnutls was added to have a fallback for
kernels prior to 3.17 in which getrandom syscall fails, see libosmocore
ed029dfab959bca74bd43d86922727c2047eeb4d.
Since sysmobts has a kernel newer than 3.7 for a long time now, but we
are still running a 201310 image (and sdk) on them which doesn't contain
gnutls, let's disable it at configure time to fix the build against the
current SDK.
Change-Id: Iaa300c0eda2cf857f8c2915c6491efe583a12874
Pau Espin
37d38f0bd9