Description:
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In order to use the php-gmp functions for cryptographic purposes, having mpz_nextprime ist sort of essential.

Reproduce code:
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url to patch (51 lines)
http://user.et-cip.rub.de/korte/php-4.4.0-gmp-nextprime.patch


Expected result:
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Use like:

<?php
  $rand1 = gmp_random(10);
  echo "Random: " . gmp_strval($rand1) . "<br>\n";
  $prime1 = gmp_nextprime($rand1);
  echo "Next Prime: " . gmp_strval($prime1) . "<br>\n";
}
?> 

Actual result:
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Working fine in our installation - would like to have in the normal distribution as well :)