Log Message:
-----------
do not use unsetenv.c on mingw
Modified Files:
--------------
pgsql:
configure (r1.632 -> r1.633)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.632&r2=1.633)
configure.in (r1.590 -> r1.591)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.590&r2=1.591)