frv fdpic: don't mess with the stack segment when stripping

[Nick Clifton]

Hi Alex,

>This patch arranges for strip and objcopy to propagate the stack size
>and alignment information, that FRV FDPIC encodes in the PT_GNU_STACK
>PHDR. 
>  
>
Approved for mainline.  Please apply.

Cheers
  Nick