Remove Windows warnings (#105)

These calls are missing their Windows counter parts, resulting warnings
stating `X is deprecated: The POSIX name for this item is deprecated.
Instead, use the ISO C and C++ conformant name: Y. See online help for
details`.

Add them like the rest.

Author: dduan

Sources/System/Internals/WindowsSyscallAdapters.swift

@@ -58,6 +58,23 @@ internal func write(
   Int(_write(fd, buf, numericCast(nbyte)))
 }
 
+@inline(__always)
+internal func lseek(
+  _ fd: Int32, _ off: off_t, _ whence: Int32
+) -> off_t {
+  _lseek(fd, off, whence)
+}
+
+@inline(__always)
+internal func dup(_ fd: Int32) -> Int32 {
+  _dup(fd)
+}
+
+@inline(__always)
+internal func dup2(_ fd: Int32, _ fd2: Int32) -> Int32 {
+  _dup2(fd, fd2)
+}
+
 @inline(__always)
 internal func pread(
   _ fd: Int32, _ buf: UnsafeMutableRawPointer!, _ nbyte: Int, _ offset: off_t