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gawk: Extension Sample Revout

 16.7.7 Reversing Output
 The 'revoutput' extension adds a simple output wrapper that reverses the
 characters in each output line.  Its main purpose is to show how to
 write an output wrapper, although it may be mildly amusing for the
 unwary.  Here is an example:
      @load "revoutput"
      BEGIN {
          REVOUT = 1
          print "don't panic" > "/dev/stdout"
    The output from this program is 'cinap t'nod'.
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