[patch] strerror return value

[Philipp Klaus Krause]

This is just a very minor issue.

gnulib contains some calls to strerror where the result is assigned
to a char *. However, according to the strerror specification, the
string returned by strerror should never be changed, so it would be
better to use const char * instead.
Most assignments of strerror return values in gnulib actually already
use a const char *.

For the 4 others,see the attached small patch.

Philipp

gnulib-strerror-const.patch
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