If eglibc (2.1.5) is selected in openwrt instead of uclibc, transmission package...

If eglibc (2.1.5) is selected in openwrt instead of uclibc, transmission package will fail to build because the function definition exported by the libtransmission/fdlimit.c is lightly different than the function definition in fcntl.h that is installed by eglibc.

To get transmission build to work both with uclibc
and eglibc, fdlimit.c needs to export function
only if the build toolchain uses uclibc.

This fixes also a openwrt bug
https://dev.openwrt.org/ticket/8820

openwrt_trunk.git/staging_dir/
toolchain-mipsel_gcc-4.6-linaro_eglibc-2.15/lib/
gcc/mipsel-openwrt-linux-gnu/4.6.3/../../../../
mipsel-openwrt-linux-gnu/sys-include/bits/fcntl.h:316:12:
error: conflicting types for 'fallocate64'
fdlimit.c:30:14: note: previous declaration of 'fallocate64' was here

Signed-off-by: Mika Laitio <mika.laitio@nokia.com>
SVN-Revision: 33012