v4.7.0 is missing some possibly useful commits, so I just took current master again.

- Update to version 4.7.0+44 (current git master):
* Fix vmstate regression
* msvc: use char* for pointer arithmetic
* Align outgoing packets
* Bump incoming packet alignment to 8 bytes
* msvc: fix some gcc-specific pragma warnings
* msvc: enable vmstate code on !gnuc
* vmstate: only enable when building under GNU C
* ncsitest: Fix build with msvc
* Avoid running git-version-gen when building with MS VC
* windows: export symbols
* win32: replace strcasecmp with g_ascii_strcasecmp
* Drop spurious inline
* Avoid returning void
* Fix arithmetic on void *
* Avoid using ##__VA_ARGS__ gcc extension
* Fix bitfields order for MSVC
* Separate out SLIRP_PACKED to SLIRP_PACKED_BEGIN/END
* Do not use ssize_t on Windows
* Do not include unistd.h on windows, it does not have it
* Accept build-aux/git-version-gen failing to run
* container_of: avoid using __extension__
* ncsi: Add Mellanox Get Mac Address handler
* slirp: Add out-of-band ethernet address
* ncsi: Add OEM command handler
* ncsi: Add basic test for Get Version ID response
* ncsi: Use response header for payload length
* ncsi: Pass command header to response handlers
* src/slirp.h: Bump the minimum Windows version to Windows 7
* ncsi: Add Get Version ID command