Bug fix for es 0.9alpha1, for SunOS 4 users.

["Harald Hanche-Olsen" <hanche@imf.unit.no>]

I already reported this to Paul, but the list should also hear about it:

If you use es 0.9 on SunOS 4, go edit config.h.  In the section below the
lines

/* SunOS 4.x defaults */

#if sun && !SOLARIS

change the line

#define	GETGROUPS_USES_GID_T	1

into

#define	GETGROUPS_USES_GID_T	0

The crash caused by having getgroups() overwrite the end of its array was
a bit of work to diagnose...

- Harald