Log Message:
Update to 3.01alpha21 and fix some pkglint warnings.

This release adds some workarounds for compiling with MinGW. New
functions xcomerr(), xcomerrno(), fxcomerr(), and fxcomerrno() in
libschily. A bug in libschily/format.c that caused %.*s to be
printed incorrectly has been fixed. libschily/fprformat.c gives
better printf() performance on Solaris. Some bugs in the mkisofs
man page have been fixed. Mkisofs now opens "NUL" on Win-DOS instead
of "/dev/null".