Improve behaviour with SDL 1.2.14 with respect to lock keys.
What works:
- dosbox compiled against SDL < 1.2.14 used with SDL < 1.2.14
- dosbox compiled against SDL < 1.2.14 used with SDL >= 1.2.14
- dosbox compiled against SDL >=1.2.14 used with SDL >= 1.2.14
What doesn't work:
- dosbox compiled against SDL >=1.2.14 used with SDL < 1.2.14
- debian/ubuntu SDL < 1.2.14. (Check comment in src/gui/sdlmain.cpp on how to fix it.)
Untested:
- debian/ubuntu SDL >=1.2.14.
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3689
b25d481e66