Fix several problems with mkdir:

1)  Fix mkdir -p to exit with the proper exit status and issue an error
    message if it was unable to create all of the specified directories
    and they did not previously exist.  POSIX says:

    The mkdir utility shall exit with one of the following values:

    0  All the specified directories were created successfully or the
       -p option was specified and all the specified directories now
       exist.

    E.g.

    % mkdir -p /var/mkdir
    mkdir: /var/mkdir: Permission denied

    % touch /tmp/file
    % mkdir -p /tmp/file/dir
    mkdir: /tmp/file: Not a directory

    Previously the above examples would exit with a zero exit status
    and no error message.  Something like the following run as a
    normal user will still not produce an error:

    % id
    uid=629(mpp) gid=629(mpp)....
    % mkdir -p /usr/local/etc
    % ls -ld /usr/local/etc
    drwxr-xr-x  4 bin  bin  512 Dec 26 14:55 /usr/local/etc/

2)  Cleaned up the mode handling to be more efficient when multiple
    directories are being created.

3) Fixed a problem where directories could be created with the wrong mode
   if the the -p option was specified and the build() routine returned
   and error.  It would leave the umask set incorrectly at this point.

4) Removed an unused variable.

Closes PR# 2304.

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