[patch,avr,2.45] Backport PR33197 to 2.45 release branch

[Nick Clifton]

Hi Johann,

> This patch is a fix from Alan that avoids
> 
> ${var+text}
> 
> in ld/scripttempl/avr.sc where text is multi line and
> contains \".
> 
> https://sourceware.org/PR33197
> 
> IIUC this is needed for older versions of bash that have
> trouble with such expressions.
> 
> Ok for binutils-2_45-branch?

Yes - please go ahead and commit it.

Cheers
   Nick