externals: Use yuzu-emu/discord-rpc to provide Discord integration

Our fork includes a commit to disable clang-format, preventing the dirty
flag from being set when building yuzu on CI.

.gitmodules

@@ -21,7 +21,7 @@
 	url = https://github.com/libusb/libusb.git
 [submodule "discord-rpc"]
     path = externals/discord-rpc
-    url = https://github.com/discord/discord-rpc.git
+    url = https://github.com/yuzu-emu/discord-rpc.git
 [submodule "Vulkan-Headers"]
     path = externals/Vulkan-Headers
     url = https://github.com/KhronosGroup/Vulkan-Headers.git

externals/discord-rpc

@@ -1 +1 @@
-Subproject commit 963aa9f3e5ce81a4682c6ca3d136cddda614db33
+Subproject commit 20cc99aeffa08a4834f156b6ab49ed68618cf94a