tools/fakeroot: remove undefined symbol messages

tools/fakeroot: remove undefined symbol messages

glibc started to return errors from dlerror() for dlsym() lookup failures which
results in a lot of messages from fakeroot like

dlsym(acl_get_fd): staging_dir/host/lib/libfakeroot.so: undefined symbol: acl_get_fd
dlsym(acl_get_file): staging_dir/host/lib/libfakeroot.so: undefined symbol: acl_get_file
dlsym(acl_set_fd): staging_dir/host/lib/libfakeroot.so: undefined symbol: acl_set_fd

when building OpenWrt using a recent glibc. Use the patch from the upstream
Debian package to silence these messages.

Link: https://bugs.debian.org/830912
Fixes: FS#3393
Signed-off-by: Sven Wegener <sven.wegener@stealer.net>