Log Message:
dosbox: Update to 0.74.3

0.74-3
A security release for DOSBox 0.74:
- Fixed that a very long line inside a bat file would overflow the parsing
  buffer (CVE-2019-7165 by Alexandre Bartel)
- Added a basic permission system so that a program running inside DOSBox
  can't access the contents of /proc (e.g. /proc/self/mem) when / or /proc
  were (to be) mounted (CVE-2019-12594 by Alexandre Bartel)
- Several other fixes for out of bounds access and buffer overflows.
- Some fixes to the OpenGL rendering.