Format cleanup.

Format cleanup.
- fixed ports.c to use a more portable method of getting integral pthread_t representation; resolves mingw crash.
- added GCC attribute to generate compiler warnings for invalid usage of hb_log, hb_deep_log and hb_errror;
  see new macro HB_WPRINTF(s,v) in common.h.
- fixed various invalid usage of above functions on osx i386/x86_64, and mingw.

git-svn-id: svn://localhost/HandBrake/trunk@2618 b64f7644-9d1e-0410-96f1-a4d463321fa5