fix some dead links

BUILDING.md

@@ -63,7 +63,7 @@ for more.
 
 ## Windows / Visual Studio
 
-To build gamenetworkingsockets on Windows, it's recommended to obtain thge dependencies by using vcpkg in ["manifest mode"](https://vcpkg.readthedocs.io/en/latest/users/manifests/).  The following instructions assume that you will follow the vcpkg recommendations and install vcpkg as a subfolder.  If you want to use "classic mode" or install vcpkg somewhere else, you're on your own.
+To build gamenetworkingsockets on Windows, it's recommended to obtain thge dependencies by using vcpkg in ["manifest mode"](https://learn.microsoft.com/en-us/vcpkg/concepts/manifest-mode).  The following instructions assume that you will follow the vcpkg recommendations and install vcpkg as a subfolder.  If you want to use "classic mode" or install vcpkg somewhere else, you're on your own.
 
 If you don't want to use vcpkg, try the [manual instructions](BUILDING_WINDOWS_MANUAL.md).
 
@@ -128,7 +128,7 @@ $ brew install protobuf
 ## MSYS2
 
 You can also build this project on [MSYS2](https://www.msys2.org). First,
-follow the [instructions](https://github.com/msys2/msys2/wiki/MSYS2-installation) on the
+follow the [instructions](https://www.msys2.org/wiki/MSYS2-installation) on the
 MSYS2 website for updating your MSYS2 install.
 
 **Be sure to follow the instructions at the site above to update MSYS2 before