Don't assume realloc() can handle NULL pointers (backport from trunk)

[mmh] / ChangeLog

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 2008-05-21  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
 
+       * sbr/utils.c (mh_xrealloc): don't assume realloc() can
+       handle NULL pointers; some non-POSIX realloc()s can't.
+       (Ported from trunk.)
+
        * sbr/dtimep.lex: add some table size declarations for the
        benefit of elderly lexes with small defaults. (Ported from
        trunk.)