* pkg.c: New file.

* pkg.c: New file.
* error.c (winerror): Respond to gcc warning.
* path.c (cygpath_pipe): Ditto.
* setup.c (filedel): Call sa_cleanup on deleteme.
(create_shortcut): Coerce argument to eliminate compiler warning.
(tarx): Use installed version of cygwin1.dll, overriding tar file name.
(refmatches): New function.  Tests if ref is contained in a list of packages to
install.
(filematches): New function.  Tests if filename matches one of a list of
packages to install.
(recurse_dirs): Accept list of packages to install.  Generalize tar.gz test to
accomodate _tar.gz.
(prompt): Ensure that stdout is flushed prior to asking for input.
(findhref): Initialize variables to quiet a compiler warning.
(processdirlisting): Accept list of packages to install.  Special case cygwin
tar file version number.
(downloaddir): Accept list of packages to install.
(downloadfrom): Ditto.
(create_uninstall): Eliminate unneeded variables.  Quote arguments to regtool.
(do_start_menu): Don't create uninstall bat file if updating or user specified
a list of packages.
(mkmount): Eliminate unneeded variables.
(get_pkg_stuff): New function.  Checks for previous unversioned installation.
(main): Accept -u and -f options and package names on the command line.  Use
get_pkg_stuff to initialize package information.  Umount /etc.  Call
recurse_dirs and downloadfrom with list of package to install.  Ensure that all
/usr/local directories are created.  Output installation time to setup.log.
* setup.h: Add some prototypes.
* xsystem.c (xcreate_process): Eliminate unneeded variable.