Build fails with latest libxml2 v2.11.0

[triplef]

The latest libxml2 release contains this change that removes the checked field from struct _xmlEntity. This field is used here in GSXML.m:

libs-base/Source/Additions/GSXML.m

Lines 2674 to 2677 in f7aa3a9

	if (ret->checked == 0)
	{
	ret->checked = 1;
	}

This causes builds to fail, as can be seen in the latest tools-android and tools-windows-msvc monthly builds:

GSXML.m:2674:24: error: no member named 'checked' in 'struct _xmlEntity'
              if (ret->checked == 0)
                  ~~~  ^
GSXML.m:2676:24: error: no member named 'checked' in 'struct _xmlEntity'
                  ret->checked = 1;
                  ~~~  ^

I’m not really sure what this code above is for. I’d appreciate if someone could take a look at how to fix this.