Bug 757593: Fix build error. _MD_INTERVAL_INIT used to be defined in _unixos.h. Now it needs to be defined in this file for Solaris. Remove an unnecessary #ifndef _PR_PTHREADS test and redundant PRIntervalTime function declarations and macro definitions in the #if !defined(_PR_PTHREADS) part of the file. TBR=kaie.
Bug 757593: Fix build error. _MD_INTERVAL_INIT used to be defined in
_unixos.h. Now it needs to be defined in this file for Solaris. Remove an
unnecessary #ifndef _PR_PTHREADS test and redundant PRIntervalTime
function declarations and macro definitions in the
#if !defined(_PR_PTHREADS) part of the file. TBR=kaie.

thespooler/nspr,thespooler/nspr,thespooler/nspr,thespooler/nspr,thespooler/nspr