[Asterisk-code-review] pbx_variables: Use const char if possible. (asterisk[master])

[N A]

Attention is currently required from: George Joseph.

N A has posted comments on this change. ( https://gerrit.asterisk.org/c/asterisk/+/19055 )

Change subject: pbx_variables: Use const char if possible.
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Patch Set 1:

(1 comment)

Patchset:

PS1: 
> Go ahead and cherry-pick.
I've only cherry picked to 20, since this is an API change... though not likely an API used by anything. Let me know if you think it's fine to also cherry pick to 16/18/19.



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Gerrit-Project: asterisk
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Gerrit-Change-Id: I001357177e9c3dca2b2b4eebc5650c1095b3da6f
Gerrit-Change-Number: 19055
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