libpcap: update to 1.20.2

libpcap: update to 1.20.2

A huge rewrite in libpcap was introduced by dc14a7babca1 ("rpcap: have
the server tell the client its byte order.") [0]. The patch
"201-space_optimization.patch" does not apply at all anymore. So remove
it.

Refresh:
- 100-no-openssl.patch
- 102-skip-manpages.patch

Update the "300-Add-support-for-B.A.T.M.A.N.-Advanced.patch" with latest
PR [1].

old ipkg size:
90964 bin/packages/mips_24kc/base/libpcap1_1.10.1-5_mips_24kc.ipk

new ipkg size:
93340 bin/packages/mips_24kc/base/libpcap1_1.10.2-1_mips_24kc.ipk

[0] - https://github.com/the-tcpdump-group/libpcap/commit/dc14a7babca1471809bee6872539ff836937840e
[1] - https://github.com/the-tcpdump-group/libpcap/pull/980

Signed-off-by: Nick Hainke <vincent@systemli.org>