export signgam

Charles Wilson cwilson@ece.gatech.edu
Thu Jul 26 12:48:00 GMT 2001

It seems that some packages (especially plotutils) assume that if gamma, 
lgamma, j0, and erf all exist, then signgam does too. This breaks on 
cygwin, since signgam exists but is not exported.  However the 
assumption is not unreasonable, so here's a patch to export the symbol.


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