FoundationEssentials: add some type overloads for WinSDK

clang imported types in WinSDK do not sometimes match the expected
types. Add overloads to shadow the types and match expectations. This
repairs the build after swiftlang#634.

Author: compnerd

Sources/FoundationEssentials/WinSDK+Extensions.swift

@@ -157,6 +157,22 @@ package var FILE_SHARE_WRITE: DWORD {
     DWORD(WinSDK.FILE_SHARE_WRITE)
 }
 
+package var FILE_TYPE_CHAR: DWORD {
+    DWORD(WinSDK.FILE_TYPE_CHAR)
+}
+
+package var FILE_TYPE_DISK: DWORD {
+    DWORD(WinSDK.FILE_TYPE_DISK)
+}
+
+package var FILE_TYPE_PIPE: DWORD {
+    DWORD(WinSDK.FILE_TYPE_PIPE)
+}
+
+package var FILE_TYPE_UNKNOWN: DWORD {
+    DWORD(WinSDK.FILE_TYPE_UNKNOWN)
+}
+
 package var FIND_FIRST_EX_LARGE_FETCH: DWORD {
     DWORD(WinSDK.FIND_FIRST_EX_LARGE_FETCH)
 }