lib, misc: eliminate dependency on Winsock

lib, misc: eliminate dependency on Winsock

Currently Windows builds of e2fsprogs rely on the Windows Socket API
(Winsock) to provide htonl() and ntohl().  For this to actually work,
though, HAVE_WINSOCK_H needs to be defined, and the binaries need to be
linked to -lws2_32.  The Android.bp files do this; however, the
autotools-based build system does not.

Since htonl() and ntohl() are trivial, let's instead just add a file
include/mingw/arpa/inet.h with definitions for these.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>