[easytag] (20 commits) ...Fix redefinition warning from TagLib

[David King <davidk src gnome org>]

Summary of changes:

  65435b7... Fix compilation of misc test (*)
  91e48e8... Handle OptimFrog files as if they are unknown (*)
  2db55ba... Remove redundant declaration (*)
  0a6d022... Add missing default cases in switch statements (*)
  6f19b85... Avoid shadowed variable warnings (*)
  e90a7e8... Avoid unhandled switch cases warning (*)
  9110197... Avoid old-style function declaration (*)
  e0a9c2f... Fix sign comparison warnings (*)
  127157d... Fix const correctness warnings (*)
  3aaf603... Port to AX_COMPILER_FLAGS (*)
  7f2d67b... Use AX_IS_RELEASE to control compiler warnings (*)
  8097699... Use AX_GENERATE_CHANGELOG (*)
  4d2e91f... Refactor function to check if all files are saved (*)
  e9225a1... Refactor file list freeing functions (*)
  f6f2e4d... Refactor artist album file list functions (*)
  e319c90... Remove unused displayed list function (*)
  8a94b7d... Refactor several file list functions (*)
  44ee9ec... Remove several unused functions (*)
  ecf346d... Fix redefinition warning in Windows compat code
  a2d8e7a... Fix redefinition warning from TagLib

(*) This commit already existed in another branch; no separate mail sent