* libc/stdio/open_memstream.c (internal_open_memstream_r): Initialize
	c->pos to 0.
	* grp.cc (get_groups): Don't add gid to list if it's ILLEGAL_GID.
	(getgrouplist): Return number of groups, just like glibc.
*** empty log message ***
	* grp.cc (getgrouplist): Fix previous fix so ret is only set to ngroups
	if ngroups isn't too small.
	* libm/complex/complex.tex: Fix wrong syntax in documentation.
	* libm/math/math.tex: Ditto.
Merge branch 'Cygwin' into develop