How does CI system get updated?

[Stephen Hemminger <stephen@networkplumber.org>]

This warning is due to a very old version of Mingw installed in CI system.

==== 20 line log output for Windows Server 2019 (dpdk_mingw64_compile): ====
In file included from ..\lib\net/rte_ip.h:21,
from ../lib/net/rte_dissect.c:20:
C:/mingw64/mingw64/x86_64-w64-mingw32/include/ws2tcpip.h:447:63: note: expected 'PVOID' {aka 'void *'} but argument is of type 'const uint8_t *' {aka 'const unsigned char *'}
WINSOCK_API_LINKAGE LPCSTR WSAAPI InetNtopA(INT Family, PVOID pAddr, LPSTR pStringBuf, size_t StringBufSize);
~~~~~~^~~~~
../lib/net/rte_dissect.c:292:29: error: passing argument 2 of 'inet_ntop' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
inet_ntop(AF_INET6, ip6_hdr->dst_addr, dbuf, sizeof(dbuf));
~~~~~~~^~~~~~~~~~
In file included from ..\lib\net/rte_ip.h:21,
from ../lib/net/rte_dissect.c:20:
C:/mingw64/mingw64/x86_64-w64-mingw32/include/ws2tcpip.h:447:63: note: expected 'PVOID' {aka 'void *'} but argument is of type 'const uint8_t *' {aka 'const unsigned char *'}
WINSOCK_API_LINKAGE LPCSTR WSAAPI InetNtopA(INT Family, PVOID pAddr, LPSTR pStringBuf, size_t StringBufSize);
~~~~~~^~~~~

It was fixed upstream in Mingw 4 years ago.