do not use unsetenv.c on mingw

Andrew Dunstan <andrew@dunslane.net>

Commit: 30735adfe4a6682a35545b5b830263740655c923
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2009-02-12T15:12:47Z
Releases: 8.4.0
do not use unsetenv.c on mingw

Files

PathChange+/−
configure modified +117 −1
configure.in modified +14 −2