inc/crt/sys/types.bi: Provide off_t on Windows too, like MinGW

Both MinGW.org and MinGW-w64 headers provide the off_t type, which is also
used by many C libraries. I.e. we need it for FB bindings.

Not to be confused with the msvcrt _off_t type, which apparently is always
32bit, while the POSIX off_t depends on _FILE_OFFSET_BITS.

Author: dkl

changelog.txt

@@ -23,6 +23,7 @@ Version 1.01.0
 	ncurses 5.9
 	PDCurses 3.4
 	zlib 1.2.8
+	crt/sys/types.bi now provides off_t on Windows, like MinGW.org and MinGW-w64
 
 [fixed]
 - 1.00.0 regression: DRAW x/y pen position was reset during X<address> subcommands, instead of being preserved and passed to/from the subcommands

inc/crt/sys/win32/types.bi

@@ -17,5 +17,17 @@ type _pid_t as integer
 type _mode_t as ushort
 type _sigset_t as integer
 type _ssize_t as integer
+type off32_t as long
+type off64_t as longint
+
+#ifdef _FILE_OFFSET_BITS
+	#if _FILE_OFFSET_BITS = 64
+		type off_t as off64_t
+	#else
+		type off_t as off32_t
+	#endif
+#else
+	type off_t as long
+#endif
 
 #endif