pspp: Debian / Ubuntu - Compiler settings for ppc64el architecture

[Friedrich Beckmann]

Hi Steve,

thanks for the bug report and your patch. From my point of view this is a bug 
in the compiler if the test suite does not pass on the ppc64el architecture 
with -O3 optimization settings on Ubuntu. However, the problem seems still to 
be there when 1.2.0-4 was compiled on 22nd of May: 

https://launchpad.net/ubuntu/+source/pspp

pspp still fails on ppc64el and riscv64 on ubuntu without the patch, i.e. with 
-O3, while it works on Debian:

https://buildd.debian.org/status/package.php?p=pspp

I think I will include your patch.

Friedrich