miku: Override mpv to prefix with DRI_PRIME

hosts/miku.nix

@@ -26,6 +26,7 @@ in {
    #  sha256 = "0r2pcc6sjxmhg1xxk23648wrwccv2c5v44cfwglx35az5y0hmr1f";
    #}))
 
+    # Steam overlay
     (final: prev:
       let
         # NOTE: This is a really messy solution
@@ -48,6 +49,16 @@ in {
         steamcmd = final.steamPackages.steamcmd;
       })
 
+    # Simple overrides
+    (final: prev: {
+      mpv = prev.wrapMpv prev.mpv-unwrapped {
+        # Prevent the need for prefixing mpv with DRI_PRIME=1
+        extraMakeWrapperArgs = [
+          "--set" "DRI_PRIME" "1"
+        ];
+      };
+    })
+    
     customPkgs
   ];