This update for libqt4 fixes the following issues:
- CVE-2018-15518: Fixed a double free in QXmlStreamReader (bsc#1118595)
- CVE-2018-19873: Fixed a segmantation fault via a malformed
BMP file (bsc#1118596).
- CVE-2018-19869: Fixed an improper checking which might lead to
a crach via a malformed url reference (bsc#1118599).
- Added stricter toplevel asm parsing by dropping volatile
qualification that has no effect (bsc#1121214).