Add test for CVE-2003-0107

Add test for CVE-2003-0107

CVE-2003-0107[0] was a bug where zlib 1.1.4 failed to validate whether
arguments to gzprintf() fit within an internal buffer.

We should make sure that in refactoring we don't regress. Therefore,
build the sample code supplied in the original report [1], and check
if it crashes.

[0] http://www.cvedetails.com/cve/CVE-2003-0107/
[1] http://www.securityfocus.com/archive/1/312869

Signed-off-by: Daniel Axtens <dja@axtens.net>