Also change upstream to github.

This change moves away from stable release. Because we need CMakeLists.txt. It is not in any release yet.

They are likely to release another stable version within this year. We can upgrade to that version when it is available.

Bug: 157157503
Change-Id: If6f245dbabe36a114563d209c8e100b7e3083f20

For https://bugzilla.gnome.org/show_bug.cgi?id=758606

* parserInternals.c:
(xmlNextChar): Add an test to catch other issues on ctxt->input
corruption proactively.
For non-UTF-8 charsets, xmlNextChar() failed to check for the end
of the input buffer and would continuing reading.  Fix this by
pulling out the check for the end of the input buffer into common
code, and return if we reach the end of the input buffer
prematurely.
* result/HTML/758606.html: Added.
* result/HTML/758606.html.err: Added.
* result/HTML/758606.html.sax: Added.
* result/HTML/758606_2.html: Added.
* result/HTML/758606_2.html.err: Added.
* result/HTML/758606_2.html.sax: Added.
* test/HTML/758606.html: Added test case.
* test/HTML/758606_2.html: Added test case.