Revert "Change toolchain path"

This reverts commit 4e0f172701dae3f245ce469de0bc1b3c289dd0f7.
Revert "Switch to gcc4.6"

This reverts commit 46dfedfe5dd120660ca7dcf065d46b47e6750a6d.
Revert "use prebuilt busybox and bootmenu binaries"

This reverts commit 738520cd34f82d767854c5c7057e6c80a8b31092.
Revert "use prebuilt busybox"

This reverts commit 92fadf916b06b36f84ab3cc8bfea0af7b3ce6c8f.