Enable multilib before installing Steam

bin/blob-install-gaming-gpu-lib32

@@ -27,4 +27,7 @@ elif blob-hw-nvidia-without-gsp; then
   PACKAGES+=(lib32-nvidia-580xx-utils)
 fi
 
-(( ${#PACKAGES[@]} > 0 )) && blob-pkg-add "${PACKAGES[@]}"
+if (( ${#PACKAGES[@]} > 0 )); then
+  blob-pkg-multilib
+  blob-pkg-add "${PACKAGES[@]}"
+fi