M68k: Kill warnings generated by gcc-3.2:
  - Add missing <linux/string.h> include
  - Move unused static data inside usage area
  - Kill deprecated multi-line string literals
  - Add semicolons to empty cases in switch() constructs
  - Comment out unused labels
  - Fix extra tokens at end of #endif directives
  - a3000_release() may not be optimized away
  - Kill uninitialized variable warning