Update tcpdump-stdinc.h

Put WinPcap's header "bittypes.h" before potentially defining basic types like "uint8_t". Define EAFNOSUPPORT unless defined in system's <errno.h>. The local Win32/Include/errno.h is gone.
Delete errno.h

Don't let this local errno.h mess with the system's <errno.h>. Ref. inclusion of <errno.h> in tcpdump-stdinc.h.
Update tcpdump-stdinc.h

Probably safe to assume MSVC has a `<stdint.h>` too.
Update inet_pton.c

Removed <errno.h> here since it's already included in ./tcpdump-stdinc.h. The local 'win32/Include/errno.h' is deleted.
Update TESTonce

Adapt script for Strawberry Perl and possibly other Win32 Perls. The program is windump.exe on Windows.
Use proper declaration

'eproto_db' is in libpcap. Thus use a proper 'extern __declspec(dllimport)' declaration.
Create ether_ntohost.c

It's a major hassle to use 'pcap_next_etherent()' in Windump. So simply add a local 'ether_ntohost()' here.
Update WinDump.vcproj

Update for using ./win32/Src/ether_ntohost.c. Hope the .vcproj is correct (untested).
Update WinDump.dsp

Update for using win32/Src/ether_ntohost.c. (Untested .dsp file)
Merge pull request #386 from gvanem/master

tcpdump-stdinc.h cleanup