Added strlen() for deque class.
Added strlen() for deque class.

ddysher/turbo,zcsteele/turbo,YuanPeir-Chen/turbo-support-mipsel,luastoned/turbo,YuanPeir-Chen/turbo-support-mipsel,luastoned/turbo,kernelsauce/turbo,mniestroj/turbo,ddysher/turbo,zcsteele/turbo