Add <sys/types.h> for off_t.
Add <sys/types.h> for off_t.

This shouldn't be necessary, but apparently on OS X 10.4 fseeko()
 takes fpos_t instead of off_t, and thus doesn't guarantee that
 off_t is defined.

SmartWalkieOrg/opusfile,xiph/opusfile,xiph/opusfile,youfearm3/opusfile,gcp/opusfile,xiph/opusfile,SmartWalkieOrg/opusfile,gcp/opusfile,youfearm3/opusfile,SmartWalkieOrg/opusfile,gcp/opusfile