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Cast "const char *" pointers to "char *" to avoid compiler warnings.

Hi,

GCC complains that some assignments loose the const-ness of several
data. This small patch adds explicit (char *) casts, but I'm not
familiar enough with what newlib does with these to be sure that they
are not modified. Maybe the proper fix would be to declare the
destinations as "const"?

Christophe

Attachment: newlib-4.txt
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