Rename some (recently added) functions.


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1092 af15c1b1-3010-417e-b628-4374ebc0bcbd
in_sdl: Remove commented-out m_filter code and a misleading comment.


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1093 af15c1b1-3010-417e-b628-4374ebc0bcbd