sdl: Make our error checking for SDL_Init(SubSystem) consistent with the SDL wiki/test programs.


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1126 af15c1b1-3010-417e-b628-4374ebc0bcbd
Windows/QuakeSpasm.rc: Revert unintended change in r1126.


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1127 af15c1b1-3010-417e-b628-4374ebc0bcbd
minor tidy-ups

git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1128 af15c1b1-3010-417e-b628-4374ebc0bcbd