Log Message:
Fixes:
  - Do not compute a pointer outside of an array.
    The original code did this and if the executable is mapped at the
    low address in virtual space, the "runsrc" value becomes ``negative''
    address and caused crash.
    Package maintainers should use a.out to detect this sort of botches. :D

  - Fix usage of mktime(3).

  - Fix usage of tolower(3).

Changes:
  - Honor umask for file mode.

  - Add a hack to handle self-extracting cabinet (*.exe).