Fix for sphde build issue with GCC 4.4

There has problem with build sphde for the x86_64 using older versions
of GCC (before 4.6). I used the __int128 type to performance a scaled
integer timebase to time-of-day conversion. The avoid integer divides
and using only integer multiply and shifts. But the __int128 type and
support code generation was not available before GCC-4.6 while it
compiled fine on my Ubuntu 12 system it failed to compiler on x86_64
RHEL6 (GCC-4.4) or SLES11 (GCC-4.3) systems.

Tested PPC32/PPC64/X86/X86_64, 64-bit platforms where tested with both
GCC-4.4 and GCC-4.6.

This did not effect 32-bit (I used a different an slower computation) or
PPC64 (I wrote inline asm to that case).