[Driver] Add winsysroot alias to the GNU driver (#95320)

fixes #91216

Author: Andarwinux

clang/include/clang/Driver/Options.td

@@ -8597,6 +8597,8 @@ def : Separate<["-"], "Xmicrosoft-windows-sdk-root">,
     Alias<_SLASH_winsdkdir>;
 def : Separate<["-"], "Xmicrosoft-windows-sdk-version">,
     Alias<_SLASH_winsdkversion>;
+def : Separate<["-"], "Xmicrosoft-windows-sys-root">,
+    Alias<_SLASH_winsysroot>;
 
 // Ignored: