+2017-11-24 Keith Marshall <keith@users.osdn.me>
+
+ Make <winsock.h> and <winsock2.h> duplicate code congruent.
+
+ * include/winsock.h (SOMAXCONN): Move definition into...
+ [!__INSIDE_MSYS__]: ...this guarded scope.
+
+ * include/winsock2.h: Rearrange as necessary.
+ [_BEGIN_C_DECLS, _END_C_DECLS]: Keep them balanced.
+ (_USE_SYS_TYPES_FD_SET): Define and use, as in <winsock.h>
+ [!_WINSOCK_ANOMALOUS_TYPEDEFS] (FD_SET): Declare function, not type.
+ [!_WINSOCK_ANOMALOUS_TYPEDEFS] (PFD_SET, LPFD_SET): Suppress typedefs.
+ (FD_SET, FD_ISSET, FD_CLR, FD_ZERO): Reimplement, as in <winsock.h>
+ (FD_READ_BIT, FD_WRITE_BIT, FD_OOB_BIT, FD_ACCEPT_BIT)
+ (FD_CONNECT_BIT, FD_CLOSE_BIT, FD_QOS_BIT, FD_GROUP_QOS_BIT)
+ (FD_ROUTING_INTERFACE_CHANGE_BIT, FD_ADDRESS_LIST_CHANGE_BIT)
+ (FD_MAX_EVENTS): Enumerate them, as in <winsock.h>
+ [!(defined __INSIDE_CYGWIN__ || defined __INSIDE_MSYS__)]: Recast...
+ [!defined __INSIDE_MSYS__]: ...as this, throughout.
+ (gethostname): Update function prototype, adding...
+ (WINSOCK_API_LINKAGE): ...this DLL import control attribute.
+
+ * include/ws2spi.h: Tidy layout; assert copyright.
+ [_BEGIN_C_DECLS, _END_C_DECLS]: Use them, as appropriate.
+ (LPFD_SET): Delete all type references; use...
+ (fd_set *): ...this instead.
+
+2017-11-14 Keith Marshall <keith@users.osdn.me>
+
+ Establish default selection for WinSock API declaration.
+
+ * include/windows.h include/nspapi.h: Include...
+ * include/_winsock.h: ...this new system private header; it selects...
+ [_WIN32_WINNT >= _WIN32_WINNT_NT4]: ...WinSock v2 API declarations, as
+ provided by conditional inclusion of <winsock2.h>, otherwise...
+ [_WIN32_WINNT < _WIN32_WINNT_NT4]: ...WinSock v1.1 API declarations,
+ as provided by inclusion of <winsock.h>
+
+ * tests/headers.at <_winsock.h>: Add reference.
+
+2017-11-14 Keith Marshall <keith@users.osdn.me>
+
+ Update gethostname() declaration; drop Cygwin specificity.
+
+ * include/winsock.h (gethostname): Declare unconditionally; add...
+ (WINSOCK_API_LINKAGE): ...this DLL import control attribute.
+ [!(defined __INSIDE_CYGWIN__ || defined __INSIDE_MSYS__)]: Recast...
+ [!defined __INSIDE_MSYS__]: ...as this, throughout.
+
+2017-11-09 Keith Marshall <keith@users.osdn.me>
+
+ Normalize fd_set event macros for <winsock2.h> compatibility.
+
+ * include/winsock.h (FD_READ, FD_WRITE, FD_OOB, FD_ACCEPT, FD_CONNECT)
+ (FD_CLOSE): Redefine them, deriving respective values as shifts by...
+ (FD_READ_BIT, FD_WRITE_BIT, FD_OOB_BIT, FD_ACCEPT_BIT, FD_CONNECT_BIT)
+ (FD_CLOSE_BIT): ...this new enumerated count sequence, applying each
+ count to a bit flag with value of 1, in each case respectively.
+ [_WINSOCK2_H]: Extend shift count enumeration, to include...
+ (FD_QOS_BIT, FD_GROUP_QOS_BIT, FD_ROUTING_INTERFACE_CHANGE_BIT)
+ (FD_ADDRESS_LIST_CHANGE_BIT): ...these additional counts; hence...
+ [_WINSOCK2_H] (FD_QOS, FD_GROUP_QOS, FD_ROUTING_INTERFACE_CHANGE)
+ [_WINSOCK2_H] (FD_ADDRESS_LIST_CHANGE): ...define each of these.
+ (FD_MAX_EVENTS): Define unconditionally; it represents a shift count
+ of 1 greater than the offset of the last defined flag; hence...
+ (FD_ALL_EVENTS): ...derive this mask for all event flags.
+
+2017-11-09 Keith Marshall <keith@users.osdn.me>
+
+ Filter potential WinSock v2 conflicts out of <winsock.h>
+
+ * include/winsock.h [_WINSOCK2_H] <mswsock.h>: Do not include it.
+ [_WINSOCK2_H] (IP_MULTICAST_IF, IP_MULTICAST_TTL, IP_MULTICAST_LOOP)
+ (IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP, IP_DEFAULT_MULTICAST_TTL)
+ (IP_DEFAULT_MULTICAST_LOOP, IP_MAX_MEMBERSHIPS, struct ip_mreq): Do
+ not define any of these; they are not compatible with WinSock v2.
+ [_WINSOCK2_H] (SOMAXCONN): Do not define it; it will be defined
+ appropiately in <winsock2.h>
+
2017-11-09 Keith Marshall <keith@users.osdn.me>
Filter out <winsock.h> typedef anomalies.
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