makedir() had multiple bugs dating back to MH. It passed an octal constant to

makedir() had multiple bugs dating back to MH.  It passed an octal constant to
atoi(), which interpreted it as decimal, resulting in directories with no user
read or execute permissions, making nested directory creation fail.  Also, when
creating a nested directory, correct permissions were only set on the inner one.

A second `make install' would always fail because the check for whether
mh_profile.5 existed was written incorrectly.