headers: Add WSACMSGHDR related symbols in mswsock.h

Required for https://github.com/facebook/folly/blob/v2025.05.26.00/folly/io/async/AsyncUDPSocket.cpp#L67

Signed-off-by: Biswapriyo Nath <nathbappai@gmail.com>
Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-headers/include/mswsock.h

diff --git a/mingw-w64-headers/include/mswsock.h b/mingw-w64-headers/include/mswsock.h
index 2efdf14..c953271 100644
--- a/mingw-w64-headers/include/mswsock.h
+++ b/mingw-w64-headers/include/mswsock.h
@@ -167,12 +167,20 @@
     } data;
   } NLA_BLOB,*PNLA_BLOB,*LPNLA_BLOB;
 
+#if (_WIN32_WINNT >= 0x0600)
+#define _WSACMSGHDR cmsghdr
+#endif
+
   typedef struct _WSACMSGHDR {
     SIZE_T cmsg_len;
     INT cmsg_level;
     INT cmsg_type;
   } WSACMSGHDR,*PWSACMSGHDR,*LPWSACMSGHDR;
 
+#if (_WIN32_WINNT >= 0x0600)
+typedef WSACMSGHDR CMSGHDR, *PCMSGHDR;
+#endif
+
 #define WSA_CMSGHDR_ALIGN(length) (((length) + TYPE_ALIGNMENT(WSACMSGHDR)-1) & (~(TYPE_ALIGNMENT(WSACMSGHDR)-1)))
 #define WSA_CMSGDATA_ALIGN(length) (((length) + MAX_NATURAL_ALIGNMENT-1) & (~(MAX_NATURAL_ALIGNMENT-1)))
 #define WSA_CMSG_FIRSTHDR(msg) (((msg)->Control.len >= sizeof(WSACMSGHDR)) ? (LPWSACMSGHDR)(msg)->Control.buf : (LPWSACMSGHDR)NULL)
@@ -181,6 +189,15 @@
 #define WSA_CMSG_SPACE(length) (WSA_CMSGDATA_ALIGN(sizeof(WSACMSGHDR) + WSA_CMSGHDR_ALIGN(length)))
 #define WSA_CMSG_LEN(length) (WSA_CMSGDATA_ALIGN(sizeof(WSACMSGHDR)) + length)
 
+#if (_WIN32_WINNT >= 0x0600)
+#define CMSGHDR_ALIGN WSA_CMSGHDR_ALIGN
+#define CMSGDATA_ALIGN WSA_CMSGDATA_ALIGN
+#define CMSG_FIRSTHDR WSA_CMSG_FIRSTHDR
+#define CMSG_NXTHDR WSA_CMSG_NXTHDR
+#define CMSG_SPACE WSA_CMSG_SPACE
+#define CMSG_LEN WSA_CMSG_LEN
+#endif
+
 #define MSG_TRUNC 0x0100
 #define MSG_CTRUNC 0x0200
 #define MSG_BCAST 0x0400