[patch] Don't enable LTO with -O4

[Shuxin Yang]

I don't have objection.

( "= LGTm", but the 'm' is a nobody in this community. Hence, "no 
objection" :-)

On 8/23/13 2:33 PM, Rafael Espíndola wrote:
> This is probably the simplest of the changes discussed in the LTO thread.
>
> Cheers,
> Rafael