[LLD] [MinGW] Ignore the sysroot parameter

[mstorsjo]

Summary

If the sysroot parameter is passed to the clang frontend, clang already uses it to find libraries and adds -L options for it, but also passes it on to the linker. Therefore we can get pretty far by just ignoring it altogether.

[ruiu]

LGTM

MinGW/Options.td

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MinGW/Options.td

 def Bstatic: F<"Bstatic">, HelpText<"Do not link against shared libraries">;
 def major_image_version: Separate<["--"], "major-image-version">;
 def minor_image_version: Separate<["--"], "minor-image-version">;
 def enable_auto_image_base: Flag<["--"], "enable-auto-image-base">;
 def full_shutdown: Flag<["--"], "full-shutdown">;
 def O: Joined<["-"], "O">, HelpText<"Optimize output file size">;
 def v: Flag<["-"], "v">, HelpText<"Display the version number">;
 def version: F<"version">, HelpText<"Display the version number and exit">;
+def sysroot: J<"sysroot">, HelpText<"Sysroot">;
 
 // Alias
 def alias_entry_e: JoinedOrSeparate<["-"], "e">, Alias<entry>;