Update tcpdump to upstream release 4.8.1

Signed-off-by: Paul Wassi <p.wassi@gmx.at>

-size_of(old tcpdump-mini 4.2.1) = 145245 Byte
-size_of(new tcpdump-mini 4.5.1) = 149416 Byte
=> ~4.2 KByte increase

Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>

SVN-Revision: 39474

tcpdump: add SLL parsing support to tcpdump-mini, use -ffunction-sections, -fdata-sections and --gc-sections to reduce size

SVN-Revision: 35288

SVN-Revision: 33690