Declare bzerrorstrings[] to be a const object.

[Carlo Bramini]

Hello,
by looking the content of the map file, I discovered that bzerrorstrings[] is not const.
So, I would like to suggest the tiny change into the attached patch, for declaring both bzerrorstrings[] and the addressed strings as const.
The patch has been created from the latest sources into the repository with GIT.

Sincerely,

Carlo Bramini.
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