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

[Georg-Johann Lay]

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?

Johann

--

PR 33197 [AVR] Incorrect syntax in generated ldscript

Rearrange scripttempl/avr.sc to avoid oddities of shells expanding
${RELOCATING+stuff} in here documents where "stuff" contains quoted
strings.  Also I think it is better to avoid multi-line "stuff" as it
can be tricky to spot the ending brace.

(cherry picked from commit ae114fb523efe908f9e807359e2f494ee64d2801)
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