strerror_r: avoid corrupting errno on Solaris

[pspp] / ChangeLog

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 2011-05-20  Eric Blake  <eblake@redhat.com>
 
+       strerror_r: avoid corrupting errno on Solaris
+       * m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Check for Solaris behavior.
+       * doc/posix-functions/strerror_r.texi (strerror_r): Document it.
+
        strerror_r: avoid compiler warning
        * m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Don't return a char*.