Unix rtlib: Make fb_hTermQuery() more robust, try to prevent losing input
Unix rtlib: Don't drop input in fb_ConsoleReadStr()

This should be unnecessary now that fb_hTermQuery() handles input before
escape sequences on its own. Besides, this bit of code in
fb_ConsoleReadStr() apparently didn't work anyways, or else the fix for
fb_hTermQuery() wouldn't have been needed.