Clone bug for CVE-2019-1221{2,4}/freeimage to separate bugs

There is upstream fix only for CVE-2019-12211 and CVE-2019-12213 (which
was done upstream in the same upstream commit, whilst beeing different
issues) but there is not fix for CVE-2019-12212 and CVE-2019-12214. In
the later case it's even not clear if this is is an issue in freeimage.

Clone the original bug to make possible to track status separately for
the remaining issues while CVE-2019-12211 and CVE-2019-12213 could be
fixed.