gnutls: Fix build with uclibc-ng

Recent gnutls update introduced "gnulib module fopen" (gl/fopen.c) which
tries to get fopen() declaration from stdio.h by defining __need_FILE
before including the header. While this seems unnecessary for the
purpose (alegedly __need_FILE is used by headers including stdio.h to
get the FILE declaration while avoiding namespace pollution),
uClibc-ng's stdio.h behaves unexpected if __need_FILE is defined:

1) features.h is not included, therefore __BEGIN_NAMESPACE_STD (and
   likely more) is not known later on
2) it declares *only* FILE, nothing else

To avoid these problems, don't define __need_FILE in gnutls and pray
this works with other libc's as well. Actually one should fix uClibc-ng
instead.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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