[hashcash] 0.29 rc portability test

So I incorporated changes for mac OSX, freeBSD and solaris 9 (they
removed setenv(3)/unsetenv(3) which was there in solaris 8 would you
believe).

Could someone on BSD, mac OSX and freeBSD check this unreleased 0.29 to
check that changing setenv/unsetenv for putenv still compiles clean on
those platforms?

        http://www.hashcash.org/source/current/

(Cc Jeff who reported solaris 9 problem).

Adam



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