[Help-glpk] try in glpios07.c

[Cheng,Jen-Min]

Int try has been used in several subs in glpios07.c  However try is a
keyword in Microsoft Visual C++.  Will it be better to rename the int
try to int ntry in order to eliminate the use of a MSVC keyword.
Thanks.

      int i, j, try = 0, ret = 0;