Silence some warnings in the misc directory

git-svn-id: http://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3826 ed541006-0bf7-43e9-8c4d-6fc63c346d47
Extend fullresolution=0x0 to more OSes. Tested on Windows, Linux and Mac OS X. Thanks for the hint about SDL_GetVideoInfo ny00123

git-svn-id: http://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3827 ed541006-0bf7-43e9-8c4d-6fc63c346d47