tools/net/Makefile: Define PACKAGE to fix build problems

tools/net/Makefile: Define PACKAGE to fix build problems

Fixes the following build problem with binutils-2.24

gcc -Wall -O2   -c -o bpf_jit_disasm.o bpf_jit_disasm.c
In file included from bpf_jit_disasm.c:25:0:
/usr/include/bfd.h:35:2: error: #error config.h must be included
before this header
 #error config.h must be included before this header

This is similar to commit 3ce711a6abc27abce1554e1d671a8762b7187690
"perf tools: bfd.h/libbfd detection fails with recent binutils"

See: https://sourceware.org/bugzilla/show_bug.cgi?id=14243

CC: David S. Miller <[email protected]>
CC: Daniel Borkmann <[email protected]>
CC: [email protected]
Acked-by: Daniel Borkmann <[email protected]>
Signed-off-by: Markos Chandras <[email protected]>
Signed-off-by: David S. Miller <[email protected]>