gnutls_3.5.3.bb: Fix native build on distro with kernel < 3.4.17
When using distros which use old kernels gnutls fails to build
due to missing SYS_getrandom, therefore we need to check for this
before using it.
Fixes errorr e.g.
| ../../../gnutls-3.5.3/lib/nettle/rnd-linux.c: In function 'have_getrandom':
| ../../../gnutls-3.5.3/lib/nettle/rnd-linux.c:59:42: error: 'SYS_getrandom' undeclared (first use in this function)
| # define getrandom(dst,s,flags) syscall(SYS_getrandom, (void*)dst, (size_t)s, (unsigned int)flags)
Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
