Log Message:
Changes 1.43:
* healed the win32 code fork: ngrep now builds from the same
  source tree for all platforms including Windows
* re-wrote the privilege revocation logic after problems were
  reported with the SPC version, and removed non-root
  drop_privs capability altogether
* fix off-by-one bug which caused ngrep to exit 1 packet early
  when ``-A'' as invoked
* Fixed problematic configtest for old broken-redhat-glibc UDP header
* ngrep now sets a pcap filter "ip" by default, if one is not specified
* header offset fix to 802.11 processing
* support IGMP and Raw (unknown IP protocol) type packets
* support for latest versions of libpcap (0.8.3) and winpcap (3.1 beta 4)
* updated configure to autoconf 2.59, and config.guess and
  config.sub to latest versions
* updated PCRE from 3.4 to 5.0
* and various minor changes and updates to improve ngrep